Is there a easy way to test the sender ?
In response to your question yes, easier to test the tank senders than it is to check the fuel gauge. I use a ohms meter just raise and lower the float arm and the ohms meter should change. I've got a couple of senders out I'll try and remember to check them and see what they read for resistance at the full and empty positions.
About the tank straps originally my 1945 HUP had a tar coated cloth band between the tank and the strap. While my 1942 C60S had rubber strips between the tank and the steel strap. Both had the woven ground straps that have been mentioned, though the all steel fuel line provides a pretty good ground back to the fuel tank selector and filter if you don't mind the idea of gas line being a electrical ground.
Cheers Phil
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