I think if you use a multimeter you can test the switch. Whether in voltage or resistance, I'm not sure. But there should be something on that in the TSRM. They have to. As far as the gauge, I don't know, but it sounds like the gauge is faulty.
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'91 Turbo Targa 5 Spd.
'87 Corolla GT-S 5 Spd
'91 Accord Daily Driver 5 Spd
Soon to be rebuilt (All to some extent)
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