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Hello. My name is Tan.
We need to verify we have both positive and negative at the gauges. With a volt meter test for voltage on the purple wire on the gauges. Do you have voltage key on?
Do you have voltage on the purple wire key switch in the on position?
The key is the switch you stick the key in and turn to start the engine.
The purple wire is ignition circuit. No purple on the battery. So you have 12 volts on the purple wire with the key switch turned to the on position? Ok now we need to check for ground on the black or yellow wire at the gauges.
Ok. Since everything else works we must verify that the gauges are getting voltage and ground. This is the only common with all the gauges.
I will be here tomorrow so just post back as you have been and I will get your reply. Thank you.