Auto Meter 1787 User Manual
General information, Mounting, Testing
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 3
1
/
8
" speedometer in a 3
5
/
32
" dia. hole, a 3
3
/
8
" speedometer in a 3
3
/
8
" dia. hole and a 5" speedometer
in a 4
5
/
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.
3
1
/
8
" Models
3
3
/
8
" Models
5" Models
2
¼"
2
1
/
8
"
3
9
/
64
"
3
5
/
16
"
3¾
"
3
11
/
32
"
2
3
/
8
"
4
15
/
16
"
4
19
/
32
"
Once the speedometer is mounted and wired into the vehicle, the speedometer should be tested to verify that the electrical connections are work-
ing 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.
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
Additional information can also be found at
http://www.autometer.com/tech_faq.aspx
Testing
2650-1266-00
INSTALLATION INSTRUCTIONS
ELECTRIC SpEEdOMETER