Technical Old S-W fuel gauge

Need help...have old ( 50's Stud Golden hawk ) fuel and temp gauge. There is no indication as the which stud is the 12V and other from tank sending unit. These are from a car I had them in for many years and worked great. They were replaced by others, and I am now installing them in a '32 Ford old roadster. Can anyone tell me which is the 12V stud. The two wiring studs are vertical and the horizontal ones are just for mechanical mounting.

 

I'd like to know as well as I have a whole set of Stude gauges to use in my 31...

 

Thanks. I was scratching my head also.

 

That's great..Thanks, and I imagine it is the same for the temp gauge ?

 

Yep

 

Now if you have the number off the sender for that gauge that would be money....

 

Read this thread on making you own gauge tester and how to use it to find what ohms range sender you will need.
https://www.jalopyjournal.com/forum...-will-work-with-my-dumb-gauge-thingie.862020/