Hey Jim- Long time no see! I'm not an electrical expert, but I'll try and confuse you some. Oops, I meant help you some. First, I'm not sure your ignition switch should be fused. When this fuse blows, you engine dies? Or is this just fusing accessories powered when the ignition switch is on? Where is this fuse located? Second, I think the sending unit works like a variable resistor to ground. As the float rises and sinks it changes the amount of resistance at the sender. The gauge reads this amount of resistance and displays it on the gauge. If I'm correct in this thinking, one side of the gauge is hot (like you have) and the other is ground. (sender side) I think if you ground the sender side of the gauge it will read full. This will verify that the gauge works. (try this on your old gauge, if I'm wrong I don't want to owe you a NOS gauge!) The problem is most likely the sender. Are you still 6-volts? I would like to know more about the fuse that blew and what you think caused it to blow.
