It is possible that the gauge is accurate but if it is maxed out then the likely cause is the wiring is grounded and not running through the resistor in the gauge.
Basically, the way it works is there are two magnets that pull the needle to where it needs to be. So, one side is grounded, and the other side runs through a resistor which causes the needle to move through its sweep based on the sensor input.
So, if it is pegged in one direction, that tell me that the other sides magnet is not working which means that wire is grounded prior to the magnet.
So, we need to check for a short to ground or just run a new wire from the sensor to the gauge.
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Saturday, December 11th, 2021 AT 12:06 PM