Gauge Cluster Replacement
 

I got a gauge cluster from Classic Instruments. The pins in the gauge cluster at 1, 2, and 12 have no use in the new gauge adapter.

Pin #1 went to the alternator
Pin#2 was Y-d into the ignition switch and the other side went to the proportioning valve.
Pin #12 went to a junction block in the engine bay.

Since this gauge assembly came from a reputable manufacturer, I'm assuming I don't need any of these wires. I just wanted to see what everyone else's opinion was. Here are the photos as reference from my truck.

Re: Gauge Cluster Replacement
 

The pic of the ignition switch, my thumb is in front of the wire in question.

Re: Gauge Cluster Replacement
 

The purpose of #1 and #12 is to go to the ammeter. If you don't have an ammeter in your new instrument cluster you won't need those wires going to your new cluster. If you have a volt meter in your new cluster, you can use one of those wires to show the voltage at the battery or voltage at the alternator, your choice.

The purpose of the tan wire #2 that goes to the ignition switch and then to the brakes is for the brake warning light. If your new cluster does not have a brake warning light, then you won't need that wire. The reason it goes to the ignition switch is because the ignition switch shorts that wire to ground temporarily when the switch is turned to start. It is a way to test that your brake warning light bulb works.

Re: Gauge Cluster Replacement
 

I talked to a guy at Classic Instruments, and you are dead on, dude. The volt meter on the new set gets its reading from the power wire, so I don't need the 1 or 12 pin, and I just coiled up the #2 pin and wire and zip tied it back. I may use it to power something else in the near future when the suspension gets here.

Thanks again man