Trouble with gauges

Kannon Herbert said

A I’m missing a bulb socket for the brake light on the cluster, could this be causing serious issues with the total circuitry? I’d think not, but I’ve been told these clusters are complete systems and that one small problem can ruin the darn thing. Thanks for any help. I’m just stumped.

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No. The brake warning light is not grounded, and should not affect other circuits. The way it works is that there is a grounding switch on the parking brake, and a grounding switch on the brake warning pressure switch. Both these are connected together and to one end of the lamp. the other end goes to switched ignition 12V so that if the parking brake is "on" the switch grounds and completes that circuit