K 1500 Truck 4WD V8-454 7.4L (1988)
Table 1 (2 Of 2)
5. Find your divide ratio on Table 1. If the exact number is not there, use the next larger number. The code to the left of the divide ratio is the correct
code that will be used in step 8. If the speedometer has never been recalibrated (Programming Clip not present), go to step 6. Otherwise go to step
7.
6. Remove the Instrument Cluster and connect the connector from the Speedometer Calibration Service Unit part number 25085515 to the Instrument
Cluster. Momentarily touch the wires from the connector across the vehicle battery terminals. Remove the connector and go the step 8.
7. Using the code from step 5, check the pin configuration of the present Programming Clip. Starting at pin 7, write down a 0 or 1 depending on the
