The gauge and the sending unit are matched, correct. The 90 ohm sender is GM.

As to wiring, hot too one #1 terminal of guage, from the other terminal #2 to the sending unit center lug. Normally that's all it takes, however because you are using the polly tank.

You need to run a wire from the sender mounting plate to ground. Looking at the photo I would say the black wire too ground. That red should come from the fuel gauge