In my 61 Apache, the previous owner mounted a different gas tank under the truck. He does have wires running to the sending unit. I do not know what this gas tank came out of. I do not think the gas gauge is working correctly so I think the sending unit does not match the Ohms resistance of the original gauge. I can not get to the sending unit because the bolts for the straps are on top of the tank. I think it was mounted with the bed off. Is there a way that I can tell the resistance of the sending unit with out taking the take down?
If they do not match , is there a way I can change the resistance of the original gauge to match the sending unit? Is it best for me just to purchase an after market fuel gauge and use the sending unit that is in the tank?
Thank you