ok never had a problem with the tach but i have always noticed my dash lights were dim but last night it started jumping 0 to 6 grand and then completly stoped and now my headlights bright and dim are to dim to drive cant see at all ive looked it up and all i could come up with is bad tach but i dont kno how that coulda caused my head lights to do that and bad grounds witch i think could cause the headlight deal had anybody else had this problem?? thanks

 

Im having a problem, my speedo nor does my mileage gauge work. Could this be a fuse ?
Fuel, temp, check engine, seat belt light lights work. No speedometer or mileage ??

 

check your headlight grounds (g301 and g201) also check g401, its in the driver side foot well near the hood release latch.

You should also check the voltage at the battery with the car running. you should get 14 volts at idle, if you aren't getting 14 volts or if its not steady you might have a problem with your alternator

 

your speedo cable is either snapped or disconnected, please do some searching regarding reconnecting and checking the speedo cable, theres no need to threadjack.