Bench testing an instrument cluster (1993-1994)

I pulled my instrument cluster yesterday to replace the lights. Noticed why my oil pressure gauge didn't work, several broken traces. I repaired the traces and I wanna bench test it to see if it all works now because it was a pain to remove.

I know I can use a potentiometer to test the gas gauge after jumping the slosh module, and I can pull the temperature sensor and hook it up directly to test the temperature gauge, and a variable power supply can be used to test the battery/alternator gauge, but what about the tach and oil pressure?