Check the ground going to the sending unit.
Also - on some GM's you can (have to) ground the purple wire going to the
sending unit quickly to re-sync the gauge. I would not use a direct short
but something like a circuit tester light.
Finally - what do you mean by pegged to the right? Some GM gauges will go
all the way around such that the needle is at the 6:00 position. If this is
the case you have to rotate the needle back around manually. On some
models, you can use a straightened out paperclip through the hole where the
trip meter or odometer reset is, and gain access to rotate the gauge.
The gauge is a voltmeter. There is no flow through the sending unit to
ground so the meter pegs when power is applied. Turn power off and it goes
back to zero. Go back to the sending unit and find where you screwed up.
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