I have installed a Classic Update Series kit in my car and hooked up the tachometer lead wire to the tachometer, but my tachometer is not registering correctly. I am using an Autometer Ultra Lite tachometer. The motor is a 2002 LS-1 using a stock GM computer.

Autometer states that if the tachometer is registering a signal but showing an incorrect tachometer reading, the problem is in the calibration setting. The factory setting is for 8 cylinder operation. Reset the calibration for 4 cylinder operation for this ECU and the tachometer should register correctly.