Answer 85 Toyota PU gaugesSince the speedometer is a mechanical connection and the rest electical, about the only thing that is going to affect them all is water. Does the windshield leak. Could be just bad luck the speedometer went at the same time as the gauges, but doubtful.
The speedometer and gas gauge going out tat the same time indicate an electrical problem. The instrument cluster may have to be removed and the circuit board checked for loose connections or cold solder joints.
Probably the electronics going bad.
Maybe cable is going bad and will have to be replaced
The fault could be the sending unit or the dash gauge.
If the speedometer needle is going crazy and not working properly, it is probably the speedometer mechanism that needs to be replaced. It could also mean the vehicle is having a transmission slippage problem if the needle is bouncing back and forth.
The oil pressure gauge is going to fluctuate on a Toyota Tacoma or any automobile. The oil pressure is less when the auto is idling and more when the auto is going down the road.
There are several reasons why a gas gauge could stop working. A short in the wire from the sending unit could be the culprit. The computer that controls the dashboard gauges could be going out.
The speedometer was going very high up.
Generally when a speedometer is going backwards the person is slowing down or stopping. If that is not the case see a mechanic.
i had my 84 supra up to 135mph. this is despite the speedometer only going up to 130mph. my buddy in his 944 turbo was pacing me.
It tells you how fast you are going.