If its the '92 civic in your profile:

The 1.6, 1.5 vtec, and 1.5 16valve have an electronic speedometer and takes about an hour to replace and is not hard. Also check the VSS (vehical speed sensor on the top of the transmission). Check plug, clean, replace as needed. or you actual speedometer head (cluster).


1. Locate the VSS in the top rear of the transmission. The Yellow/Blue wire is battery voltage key on and the Black wire is ground. The Yellow/White wire is a 5-volt reference voltage from the control units.

2. Plugged in, the VSS should pulse the 5 volts on the Yellow/White wire to ground when the VSS is turning. Using a scan tool, watch the signal on the Yellow/White wire. If the signal is good, check the signal at the speedometer head and verify the connection. If the connection and signal are correct, look at a faulty speedometer head.