Temp & fuel gauges - what am I overlooking?
Check the sender resistance. engine cold. Should be at least or more than the yellow print. Then warm it up some, temp resistance should start to come down. Don't discount that the wire end could be "iffy" corroded, loose, etc.
If you overtighten the oil/ temp senders you can damage them
Same deal on fuel. If you have any idea how much fuel is in it you can estimate what the resistance might be. Check that the SENDER (not just the tank is GROUNDED
the ultimate test for the cluster, end to end, is to rig some resistors for the proper test resistances, both gauges use same resistances, and see if they are accurate.
Some problems......
Loose pins at the PC board harness connector
Poor connection where the IVR plugs in. Bad/ innacurate IVR
Corroded studs / PC board where the gauges connect. Loosen the nuts and tighten/ loosen several times. Replace the cheap "tin" nuts with real ones.
No time like the present to invest in a good solid state IVR like RTE
https://www.rt-eng.com/index.php/RTE_limiter.html
Check the sender resistance. engine cold. Should be at least or more than the yellow print. Then warm it up some, temp resistance should start to come down. Don't discount that the wire end could be "iffy" corroded, loose, etc.
If you overtighten the oil/ temp senders you can damage them
Same deal on fuel. If you have any idea how much fuel is in it you can estimate what the resistance might be. Check that the SENDER (not just the tank is GROUNDED
the ultimate test for the cluster, end to end, is to rig some resistors for the proper test resistances, both gauges use same resistances, and see if they are accurate.
Some problems......
Loose pins at the PC board harness connector
Poor connection where the IVR plugs in. Bad/ innacurate IVR
Corroded studs / PC board where the gauges connect. Loosen the nuts and tighten/ loosen several times. Replace the cheap "tin" nuts with real ones.
No time like the present to invest in a good solid state IVR like RTE
https://www.rt-eng.com/index.php/RTE_limiter.html