I have been given a 1957 Fargo in boxes to assemble. It came with a new stainless steel gas tank and no sending unit! Can somebody please tell me what the range of ohms is on the fuel sender on a 1957 truck is? Also I have tried several sending units hooked to stock gauge in the dash and it appears to me, to need a voltage reducer between the accessory circuit and the gauge. What voltage do the gauges operate on? Thanks for your help in advance! I wish I had been there when this truck was taken apart....