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• Obviously, you do not want to break traction, as that will also adversely affect the calibration. • The load (weight) of the vehicle plays into the diameter of the tires, too, so be sure to have an average load in the vehicle during calibration. Connections to various vehicles We offer two styles of senders; 1. #5291 fits most GM and most Chrysler vehicles that may have previously used a cable. Both vehicles share the same size speedometer cable connector (7/8" - 18 THD). Double check to make sure this thread will match what you have on your transmission, to ensure compatibility. 2. #5292 fits most Ford transmissions that have cable outputs, and utilize a retaining "clip" to mount the cable/sender to the housing of the transmission. Both senders will replace the existing cable, or attach to the cable output of the transmission and produce a signal to drive the speedometer. Most later model transmissions without a cable can use our speedo too.They get the signal DIRECTLY from theVSS (vehicle speedo sensor), NOT from the computer. The signal after the computer is buffered (conditioned) and our speedos will not recognize that type of signal. Connect the speedo directly to the wire that sends the raw signal from the VSS. Finding the signal wire is usually quite simple. The signal wire will produce anywhere from 2V up to 120V DC peak to peak. This can be tested with a standard multimeter (the voltage should increase with the vehicle speed). Otherwise, you can look in a service manual for the signal wire, or if you can't find it anywhere, contact us and we'll see if we have the information. Speedometer Calibration Once everything is installed (both wiring and the speedometer) you can calibrate the speedo. A pushbutton is included for the calibration steps, as described in detail in the instructions.The following is a quick review of the steps. • Turn off the vehicle if it is on or running. • Press and hold the button. • Start the vehicle. • Once the vehicle is running, release the button (the pointer should go to the highest MPH reading). • Drive to the beginning of your carefully measured 2mile distance, and stop. • Press the button again (the pointer should go to half the maximum MPH reading).The speedo is ready to be calibrated. • Drive the two miles and stop. • Press the button |