420A RPM gauge / tachometer not working

[Culon1997GS]

RPM GAUGE / Tachometer not working

You must be logged in to view this image or video.

As you can see, it barely moves, and I was wondering if any of you guys knows what I should do, my car is a 1997 GS
Any tips will be appreciated

 

[petrosian]

You're using the original PCM that came with the car, right? For the 1997 US non-turbo cars (420A), the signal for the tachometer comes straight from the PCM. Has your wiring been modified or is it stock?

Also, help us help you by completing the vehicle section of your profile

You must be logged in to view this image or video.

 

[BLACK'98DSM]

The crankshaft position sensor is what provides the signal to the ECU. But if it were not functioning properly your engine would not start or run. It's likely a wiring issue, possibly the ECU. The gauge cluster isn't common to go bad on these cars but you can always remove it and look for delamination.