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Here is a picture of my gauge

Very interesting thanks. I’m using the original 2 post gauge out of my 49 F3. All it shows is if it’s charging or discharging. Hope that helps. I believe me hooking it up to my battery charger was a bad idea. I installed the cab on a 91 dodge D250 with a Cummins in it if that helps.

Is there any particular place I should wire in the positive or negative, closer to battery etc.I hooked the two wires up to the battery charger and the gauge moved. Now know which goes to positive.

I’m trying to wire my amp gauge in but don’t know how. What is the correct way to wire it. I have the two terminals on the back of my gauge and I’ve converted my truck to a 5.9 Cummins 12 volt system, negative ground

I need help. I have a 49 F1 and I’m trying to see if my switch for the heater fan is any good but I can’t tell how to wire fan. Wires were all cut(me bad) and I’m able to tell the switch runs the fan both ways. There are 4 wires running to fan and only 4 terminals on switch. I tried to include...