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  1. pb4ugo

    Maybe an easy question about guages

    Whenever i run into 12v electrical issues or basic circuit diagnosis, the 1st thing I grab is a test light. It's a simple electrical circuit. Power in 1 end, a light doing work, and a ground. I can track down an issue very quickly. Grd one end and search for power. I typically use a...
  2. pb4ugo

    Maybe an easy question about guages

    Sounds like the gauge is suspect. If the key was on and no movement or full sweep of the needle when the y/b wire is grounded. Do you have the cluster out? When removing the cluster, the wires on the amp meter are hot. You don't want them to ground. You might want to disconnect the batt...
  3. pb4ugo

    Maybe an easy question about guages

    I looked at the 71 wiring diagram on coolermans websight and shows a yellow wire supplying power to the gauge and a yellow wire with a blk stripe going to the sender.
  4. pb4ugo

    Maybe an easy question about guages

    So use a test light. Like I said it's a quick test. Your looking for a reaction of the needle to confirm the gauge is working. Don't keep it grounded.
  5. pb4ugo

    Maybe an easy question about guages

    The sender is screwed into the engine blk which grounds it. With the key on, the guage wire supplies power to the sender. The oil pressure pushes on the sender and the gauge measures the resistance created by the sender between wire and ground. So a basic test, Pull the wire off the sender...
  6. pb4ugo

    Maybe an easy question about guages

    The gauge or sender. Ground the wire at the sender and see if the gauge goes from 1 end to the other.
  7. pb4ugo

    Maybe an easy question about guages

    What's the alternative? In my experience, the 40's fuel gauge is the one that's weird. It seems it doesn't stay on F for very long and it rides close to E for a longer time. It seems a 1/2 a tank means it has slightly more than a 1/2 a tank, then falls quickly, then sits close to or on E...
  8. pb4ugo

    Maybe an easy question about guages

    Its all three. Factory gauges regardless of manufacturer all seem to be less than accurate. I use the 40's gauge cluster with my sbc. I figure if they're showing signs of movement then I'm OK. If the temp gauge goes to the extreme or the oil press gauge shows no sign of life, then there's...
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