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Fuel guage help!!!!!


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So ive never had a working fuel guage in my boat since ive bought it and decided to fix that this year. I bought a brand new gauge and sending unit. I did a dry run before installing everything and with all the wires hooked up the gauge read perfect when i moved the float on the sending unit. So i had the boat in the water for the 1st time yesterday and as soon as i fired up the engine the fuel gauge was bouncing all over. Heres how i have my wiring ran sending unit wire to sending unit post on gauge, ground from sending unit direct to battery. Ignition hot switch to gauge for power when keys on and guage grounded in line with all other guages. Any ideas what could be acting up?!?

Edited by Rtrucking40
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