Gas gauge not working after pulling cluster

[88suburbanoverlan]

Hey guys, I went to pull my cluster to replace some of the lights and disconnected the speed of cable per usual and suddenly my gas gauge is not working.

I don’t see any wires that connect back there and I’m just wondering if there is something I hook up to it or if I attach the speedo does that complete the circuit for the gas gauge to work?

 

[Scott91370]

What year truck and did the large plug get connected tightly to the back of the cluster?

 

[88suburbanoverlan]

It’s an 86 GMC suburban 2500. I ended up figuring it out and after cleaning cleaning the connectors on the wiring harness to the gauge it solved the issue.