Temp Gauge Working Intermittently - Suggestions?
If you pull the cluster you should go "clear through" it, generally
PC connector pins can be loose, and can be fixed by soldering
IVR connctor is spring loaded contacts pressed into the board. Solder bridges across them to the PC board traces
Already mentioned the gauge nuts
Replace IVR with a solid state one like RTE
Use eraser, etc, to clean up the traces where the lamp sockets fit, and bend the socket tabs for better contact