Quote Originally Posted by smewth View Post
added facts: wala po inayos sa kotse bigla na lang po nag malfunction yung tachometer pati speedometer. Also minsan lang gumana pala yung dalawa. Pag gumana sobrang liit lang ng galaw. Hindi lumalampas ng 500 rpm while yung speedometer pag 100 na takbo mo, 50 lang reading niya yung speedometer and tachometer
Maybe a grounding issue. When I studied the schematics, the fuel gauge, tach, and speedo share the same ground. This ground wire (brown) I'd look at first. It's supposed to be attached to the radio chassis.