Help!!!!
well glad you crossed him off your list,,,
gas guage,,,couild be a bad circuit board in your dash,, or just the ground strap at the back of the gas tank where the fuel line goes in to the sender,,
if you go t oan after market gas gauge,,you wil have to bypass the dash circuit board and and call tech for the correct gauge for a mopar circuit,,, GM,and most after market gauges are 90 ohm,,so you will probably have to call tech,,,of the gauge company you chose to see what the ohm is on mopar for after market gas gauge,,,,
you must of gotten some weird plugs