3020 fuel gauge question

I have a 1966 3020 factory propane that the gauge doesn t work.
I bought a new gauge through here. It has three studs whereas my old one only had 2
The tractor is neg ground.
The studs on the new gauge are marked + a ground symbol and a T. The T could be upside down.
If I hook the sender to the ground it says I have a full tank which I know I don t. If I hook it to the T nothing happens.
Any ideas guys?
 

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