Propane to stock fuel gauge wiring

[TinnMann]

Hello all! First time posting on here but have read a lot of threads. I just bought my dream truck 70' chevy c20 longhorn and she needs some work.

One of the issues i can't figure out is the fuel gauge wiring, i have done many searches and still cannot figure it out. btw i am what you call an electrical dummy.

My truck is on propane and has a stock gauge cluster. Whoever did the conversion left a wiring mess btw. Can i wire my sending unit to the pins at the back of the fuel gauge? Kind of like i have some of them connected on the picture. or do i connect it somewhere on the wiring harness?

The pins on the back of the fuel gauge: top post closer to the passenger side (right post if you are looking at the face of the gauge) is the ground? The bottom post in the tank sending unit? and the top post on the drivers side goes to the fuse panel labelled fuel gauge?

If this is correct can i wire them straight from these posts or do i need to tap into the wiring harness or pin outs somewhere? Thanks in advance!