I had an aftermarket set of gauges on my car, nothing fancy, just light up overlays.
Anyways, i got tired of them, so i took out the cluster and took off the aftermarket gauges and replaced them with stock.
of course i had to take off the needles to replace the gauges with the stock ones, and when i plugged everything back in with the needles in place, only the speedo works.

the gas gauge sits wherever i move it to, i even went and filled my tank with gas but it didn't move, and my engine temp needle sits at it's lowest point, not moving