Bench testing dash clusters ??

If you have an old round plug that goes into the factory gauges here is the colors for the wiring.

Fuel - Dark Blue
Dash lights - Orange
12V key on - Blue / White tracer
Turn signal LH - Lt Green
Turn signal RH - Tan
High beam - Red 18g
Brake - Blue/White tracer+ / Black 20g -
Purple - Water temp
Grey - Oil light