Did you use the little round splice connectors for telephones? They have silicone in them and make a waterproof connection as well as crimp the 24 gauge wire.
CH3NO2
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I feel like this shouldn't be in the sandbar. Lol.
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Post a pic of the back of the gauge. Autometer has changed the wiring on the setup over the years. Basically you will only need to use 3 wires off the puck. I can tell you how to do it after I see what you have.