Hey Barry,
I have NOS fuel tank senders in my reproduction tanks. Rod Shaver has them available for sale for the T-16 but I don't know for sure if they would work accurately in other universal carriers due to fuel tank size differences and the T-16 being a 12-volt system.
The second wire on your sender is probably a dedicated ground. The screws used to connect the sender to the tank normally do the job but corrosion, paint or loose connections can mess with the ground and cause the gauge to read off or not work at all. I know people with jeeps often solder a second wire onto the sender to guarentee a good ground.
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David Gordon - MVPA # 15292
'41 Willys MB British Airborne Jeep
'42 Excelsior Welbike Mark I
'42 BSA M20 Motorcycle
'43 BSA Folding Military Bicycle
'43 BSA M20 Motorcycle
'44 Orme-Evans Airborne Trailer No. 1 Mk. II
'44 Airborne 100-Gallon Water Bowser Trailer
'44 Ford T-16 Universal Carrier
'44 Jowett Cars 4.2-Inch Towed Mortar
'44 Daimler Scout Car Mark II
'45 Studebaker M29C Weasel
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