Auto Meter 1787 User Manual

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Auto Meter 1787 User Manual

INSTALLATION INSTRUCTIONS

ELECTRIC SpeedoMETER

2650-1266-00

QUESTIONS:

If after completely reading these instructions you have questions regarding the operation or installation of your instrument(s), please contact Auto Meter Technical Service at 815-899-0801.

You may also email us at service@autometer.com.

Additional information can also be found at http://www.autometer.com/tech_faq.aspx

General Information

This electric speedometer utilizes a LCD to display odometer and trip odometer mileage. Momentarily pressing the Trip/Reset button on the dial window cycles the odometer, trip 1, and trip 2 displays on the LCD. Pressing and holding the Trip/Reset button for more than two seconds while in either trip mode, will reset the trip odometer currently being displayed. The odometer cannot be reset.

Auto Meter electric speedometers are pre-calibrated. When converting from a cable driven speedometer further calibration may not be needed if:

1.The transmission’s speedometer cable take off is 1000 RPM at 60 MPH (97 km). Most vehicles meet this requirement.

2.The vehicle is equipped with a 16-pulse/revolution sender.

3.The speedometer that includes a 2-wire sender is pre-calibrated to 8 pulses/revolution to match this sender.

If the above conditions have not been met, the speedometer must be recalibrated (see calibration section). Also, if the vehicle’s tire size and/ or differential ratio has changed, the speedometer needs to be recalibrated.

NOTE: The odometer on this speedometer will show some mileage less than 5 miles (8 km).This is a result of factory testing to insure optimum quality.

Speedometer Senders

The speedometer is designed to operate with an electrical speed sender. The speed sender signal range must be between 500 and 400,000 pulses/mile (310 and 248,500 pulses/km). Any speed sender or electronic module that meets the following two conditions can be used:

1.Pulse rate generated is proportional to vehicle speed.

2.Output voltage within the ranges listed below:

Hall effect sender, 3-wire (5 to 16V)

Sine wave generator, 2-wire (1.4 VAC min.)

5V Square wave (CMOS)

Recommended – Auto Meter Hall effect sender, 3-wire 16 pulses/revolution. 5291 Standard 7/8 – 18 thread

5292 Ford, plug in

Mounting

1.Mount a 31/8" speedometer in a 35/32" dia. hole, a 33/8" speedometer in a 33/8" dia. hole and a 5" speedometer in a 45/8" dia. hole. Be careful not to cut the hole too large.

2.Cut a 3/8" dia. hole in the firewall for the speedometer wires. Place a rubber grommet in the hole and route the wires through the grommet to the engine compartment.

3.Connect the speedometer wires as shown in the wiring sections.

4.Secure the speedometer to the dashboard using the provided bracket and hardware.

31/8" Models

 

 

33/8" Models

2¼"

21/8"

 

 

 

 

 

 

 

 

 

 

 

 

3

5

419/32"

/16"

"

 

311/32"

39/64"

5" Models

23/8"

415/16"

Testing

Once the speedometer is mounted and wired into the vehicle, the speedometer should be tested to verify that the electrical connections are working properly. First, watch the speedometer’s pointer as the power is applied. The pointer should first move to a midrange position, then down to the 0 position on the dial. This action verifies that power is properly connected to the speedometer. The vehicle should be driven some distance to verify the Vehicle Speed Sender (VSS) is connected properly and that the pointer moves. If the pointer does not move off of the zero position, verify that the VSS is connected properly. In some cases calibration may be needed if the pointer does not register speed. Follow the calibration procedure and retest.

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