PROGRAMMABLEVEHICLE

SPEEDOMETERSINSTALLATION OF GAUGE

After checking fit of gauge and U bracket, insertgauge into panel and install bracket over mountingstuds. Install a washer and nut onto each mountingstud as shown in Figure 1.

CAUTION:MAKE SURE THAT ELECTRICAL WIRING IS

DRESSED AWAY FROM MOVING OR HOT ENGINECOMPONENTS.

See Figure 2. Connect wiring to Gauge terminalsusing washers and nuts supplied. Use wire colorsconforming to vehicleís existing color code.1. Connect a wire from GND (ground) terminal ofgauge to electrical system ground.2. Connect a wire from LT (light) terminal of gaugeto panel light switch or LT terminal of another Veethreegauge.3. Connect a wire from the positive IGN terminal ofgauge to positive 12-16 V DC power source.4A. SPEEDOMETERS USING MAGNETICPROXIMITY SENSORSRun a wire from the SEND terminal on back ofgauge to one terminal on Proximity Sensor. Run awire from the GND (ground) terminal on back ofgauge to remaining terminal on Proximity Sensor.4B. SPEEDOMETERS USING PULSEGENERATORSRun a wire from the SEND terminal on back ofgauge to one terminal on Pulse Generator. Run a wirefrom the GND (ground) terminal on back of gauge tothe other terminal on Pulse Generator. This is thepreferred method. Grounding this terminal to acommon chassis ground may introduce electrical"noise" into the signal.4C. SPEEDOMETERS USING GPS TRANSDUCERRun a wire from the send terminal on the back of the gauge to the white wire of the transducer.5. When wiring is complete, connect power. Startengine and check gauge for proper operation.

CAUTION:BEFORE RECONNECTING BATTERY TO

ELECTRICAL SYSTEM, RECHECK WIRING TOENSURE ALL CONNECTIONS ARE PROPERLY

MADE. INCORRECT CONNECTIONS ORELECTRICAL SHORTS COULD CAUSE DAMAGE

OR FIRE IN SYSTEM. ELEMENTS OF ELECTRICALSYSTEMS SHOULD HAVE

PROPPER FUSES INSTALLED.

SO19 Revesion 5

FIGURE 1

These instructions for installing, wiring, and programming the Veethree ProgramableSpeedometer with Odometer should be kept with thevehicle.

CAUTION

READ THESE INSTRUCTIONS THOROUGHLY BEFOREPROCEEDING WITH INSTALLATION. DO NOT DEVIATEFROM WIRING INSTRUCTIONS. INCORRECT WIRINGCOULD CAUSE ELECTRICAL SHORT AND POSSIBLEFIRE. ALWAYS DISCONNECT POSITIVE LEAD FROMBATTERY BEFORE MAKING ANY ELECTRICALCONNECTIONS.

NOTE: If you must use a 12vdc unit in a 24vdc system,use a Voltage Reducer, Veethree Part Number 6221776 in the "IGN" lead, and change light bulb to Veethree part number 40102-007 or equal (GE400).

PREPARATION FOR INSTALLATION1. Select a mounting location for gauge which pro-vides easy readability from the operating position.Check behind mounting panel for sufficient installationclearance.2.Depending on Speedometer model, cut either a3.395" +/- .032" (86 mm) or 4.625 (118mm) diameterhole through the panel at the desired location.3. Insert gauge into mounting hole and check for fit.4. Fit U bracket from hardware package overmounting studs on back of gauge (See Figure 1).Legs of bracket may be shortened if required.

IMPORTANT:BEFORE PROCEEDING WITH INSTALLATION AND FINAL WIRING, SPEEDOMETER MUST BE PROPERLY PROGRAMMED TO OPERATE WITH YOUR EQUIPMENT. REFER TO THE PROGRAMMING SECTION OF THIS BULLETIN BEFORE PROCEEDING.

PROGRAMMING THE SPEEDOMETERThe speedometer is accurate on any system having a frequency at full scale between:DIAL RANGE: FULL SCALE FREQUENCY DIAL RANGE: FULL SCALE FREQUENCY0-30 mph 265-6599 Hz. 0-50 km/h 444-10,999 Hz.0-85 mph 91-2337 Hz. 0-140 km/h 77-1924 Hz.0-120 mph 133-3299 Hz. 0-160 km/h 89-2199 Hz.0-160 mph 178-4399 Hz.

Programming the speedometer is accomplished in three steps:STEP 1 . Determine the Full Scale Frequency (F.S.F.).STEP 2. Calculate the Divide Number.STEP 3. Program the DIP switch “Program” section.

STEP 1: Determine the full scale frequency (F.S.F)NOTE: The tire revs/mile (or KM) may be obtained from the tire manufacturer; the number of pulses per generator revolu-tion from the pulse generator supplier, the rear axle ratio may be obtained from the chassis manufacturer; and the number ofdrive and driven gear teeth may be obtained from the transmission or chassis manufacturer.

A. If using wheel mounted magnetic proximity sensor:Tire Revs/Mile (or KM) x # of Teeth (or Slots) on wheel x Constant see below) = F.S.F.

DIAL RANGE: CONSTANT(f): DIAL RANGE: CONSTANT(f):0-30 MPH 0.0083 0-50 KM/H 0.01380-85 MPH 0.0236 0-140 KM/H 0.03880-120 MPH 0.0333 0-160 KM/H 0.04440-160 MPH 0.0444

EXAMPLE: 0-85 MPH Model: Tire Revs/Mile (or KM) x # of Teeth (or Slots) x Constant(f) = F.S.F 988.7 x 90 x 0.0236 = 2100 Hz.

B. If using transmission mounted pulse generator: (You must ascertain the number of pulses per revolution producedby the Pulse Generator used. If not one of the “pulses/rev” listedbelow, contact Veethree Technical Service. The Veethree PulseGenerator No. 9604276 is 8 pulses/revolution.

Tire Revs/Mile (or KM) x Rear Axle Ratio x (# of Drive Gear Teeth) x (# of Driven Gear Teeth) = Pulse Gen.Revs/Mile(or KM)

Pulse Gen.Revs/Mile(or KM) x Constant (see below) = F.S.F.

CONSTANT with: CONSTANT with:8 pulse/rev 16 pulse/rev 30 pulse/rev 8 pulse/rev 16 pulse/re 30 pulse/rev

0-30 MPH 0.0666 0.1333 0.2500 0-50 KM/H 0.1111 0.2222 0.41660-85 MPH 0.1888 0.3777 0.7083 0-140 KM/H 0.3111 0.6222 1.16660-120 MPH 0.2666 0.5333 1.000 0-160 KM/H 0.3555 0.7111 1.33330-160 MPH 0.3555 0.7111 1.3333

EXAMPLE: 0-85 MPH Model, 8 pulse/rev. generator Tire Revs/Mile (or KM) x Rear Axle Ratio x (# of Drive Gear Teeth)˜ (# of Driven Gear Teeth) = Pulse Gen.Revs/Mile(or KM) 988.7 x 3.01 x 4 x 5 = 2380.79Pulse Gen.Revs/Mile (or KM) x Constant = F.S.F.

2380.79 x 0.1888 = 447.59 Hz.

WIRING DIAGRAM

FIGURE 2

PAGE 2

DIALRANGE

DIALRANGE

STEP 2: Calculate the divide number:F.S.F. x Constant (see below) = DIVIDE NUMBER (the divide number must be rounded UP to next whole number).DIAL RANGE: CONSTANT: DIAL RANGE: CONSTANT:

0-30 MPH 66.66 0-50 KM/H 111.110-85 MPH 23.61 0-140 KM/H 19.44

0-120 MPH 33.33 0-160 KM/H 22.220-160 MPH 44.44

EXAMPLE: 0-85 MPH ModelF.S.F x Constant = Divide Number447.59 Hz x 23.61 = 18.83 Round up to 19. The DIVIDE number is 19.

STEP 3. Program dip switchesOn the rear of the speedometer there is an oval shaped black plug (See Figure 3). Upon removal of the plug two six- positionDIP switches will come into view. Also on the rear of the case is a blue label denoting the function of each switch position.The label is divided into two sections- Programming and Filter. Only the eight programming switches are used at this stage.

The Divide number must be programmed into the speedometer in Binary Code Decimal format. That is, the TENS position and the ONES positions must be programmed separately. EXAMPLE: Assume a divide number of 41.

41 = 40 (TENS divide number)1 (ONES divide number)

First, program the1. Refer to the chart on Page 4 and move position 1 to ON and switch positions 2, 3, & 4 to OFF.

Next, to program the 40, refer to the chart and move switch.position 7 to ON and switch position 5, 6 and 8 to OFF.

When the Divide number is 9 or below, set all the TENS switchesto OFF.

Filter dip switchesTo minimize any extraneous electrical noise from interferingwith the operation of the speedometer Veethree has incorpo-rated filter switches to fine tune the filter band to the applica tion. The filter programming is accomplished as follows:Find switch positions 9 through 12 on the DIP switch on the right. Refer to the chart labeled Filter Programming on Page 4.

NOTE: For applications using a Drive Ratio adapter providing 1000 Revs at 60 MPH, the Full Scale Frequency will be 189 Hz.and the Divide number will be 8. The program DIP switches should be set with the TENS Divide numbers to the off positionand the ONES Divide numbers set for 8. The Filter programming switches should be set for the 330-347 Full Scale Frequencypositions.

Replace the oval shaped black plug. The speedometer is now fully adjusted. The Programmable Speedometer can be usedwith pulse generator, magnetic proximity sensors without any additional adjustment. Veethree offers both senders foruse with speedometers.SPEEDOMETER ACCURACY The speedometer accuracy is determined by the magnitude of the divide number and its nearness to a whole number. Whenthe Divide number is a whole number (i.e. 42.00) the electronics error to the odometer and the vector movement is zero. Thiswould mean the only other inherent error would be the accuracy of placing the pointer on its shaft. The worst situation wouldbe to have a low Divide number resulting in a 0.5 fraction (i.e. 14.5). Since the program switches can only enter wholenumbers the 0.5 needs to be rounded up or down. Fractional numbers closer to a whole number result in much betteraccuracy.

Example# 1: 14.5 round to 15 .5/15 = 3.33% errorExample# 2: 14.94 round to 15 .06/15 = 0.4% error

The higher the divide number the more accurate the speedometer becomes.

Example #3: 88.5 round to 89 .5/89 = .56% errorExample #4: 88.13 round to 88 .13/89 = .147% error

When designing an application using a magnetic proximity sensor it is very important to try to keep the Divide number asclose to a whole number as possible. This will keep the system error to an absolute minimum. Whole number Divide numbershave no digital error.

PAGE 3

FIGURE 3

C. If using an 8 pulse GPS transducer no calculations are required. Simply set the switches for a DIVIDE number of 8. Set the four filtering switches 9 thru 12 to OFF.

Find the range of full scale frequencies in the left hand column that covers the full scale frequency of the application. Readaccross to the right and set switch positions 9 thru 12 as indicated.

PROGRAM CHART FILTER PROGRAM CHARTOnes Tens FullDivide Divide Scale

Number Number FrequencySwitch Positions Switch Positions Switch Positions

1 2 3 4 5 6 7 8 9 10 11 121 ON OFF OFF OFF 10 ON OFF OFF OFF < 347 ON OFF OFF OFF2 OFF ON OFF OFF 20 OFF ON OFF OFF 347-388 ON OFF OFF ON3 ON ON OFF OFF 30 ON ON OFF OFF 389-546 ON OFF ON ON4 OFF OFF ON OFF 40 OFF OFF ON OFF 547-695 OFF OFF OFF OFF5 ON OFF ON OFF 50 ON OFF ON OFF 696-748 OFF OFF OFF ON6 OFF ON ON OFF 60 OFF ON ON OFF 749-808 OFF OFF ON OFF7 ON ON ON OFF 70 ON ON ON OFF 809-905 OFF OFF ON ON8 OFF OFF OFF ON 80 OFF OFF OFF ON 906-1072 ON ON ON OFF9 ON OFF OFF ON 90 ON OFF OFF ON 1073-1286 ON ON ON ON

1287-1497 OFF ON OFF OFF1498-1771 OFF ON OFF ON1772-2145 OFF ON ON OFF

> 2145 OFF ON ON ON

PAGE 4

EXAMPLE: Assume a DIVIDE number of 41.That is 1 ONES. Program switch positions 1 thru 4 next to the 1 in the ONES DIVIDE NUMBER column.That is also 40 TENS. Program switch positions 5 thru 8 next to the 40 in the TENS DIVIDE NUMBER column.

Correction formula for programmable speedometersTo change or correct an existing speedometer reading to a different reading, the Program Divide Number is changed, using Switches 1 through 8 (See Figure above).

Incorrect speed reading (MPH or Km/H) x Program Divide Number Divided by Actual Speed = Correct DIVIDE number.

Example:If the speedometer reads 45 MPH at 55 MPH actual speed, and the switches are set for a Program Divide # of 65:

45 x 65 = 53.18, rounded off to 5355

In this case, the switch configuration changes from Program DIVIDE # of 65 (101001100101) to Program DIVIDE # of 53 (110010101111) where 0 = OFF, 1=ON.

Filter switches 9-12 are listed in the chart above. Determine Full Scale Frequency with the new settings by multiplying thenew Divide # x Constant 23.61.

In the above example, 53 x 23.61 = 1,251.33. If Necessary, reset switches 9-12 to reflect the correct newFull Scale Frequency.