That's cool. That's exactly how I tested mine and after spending $50 bucks it still doesn't work. I've got a Autometer hooked up to it now. You should try hooking up an aftermarket gauge if you can to see what is bad.
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72 Cheyenne SWB C10 (daily driver)
(Super fake cause I just love the glovebox emblem)
70 Camaro RS (frame-off in pieces)
70 Camaro RS (daily driver backup)
69 Custom LWB C10 (son now drives)
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