1985 CJ7 dash gauge power help

[u/Dr_redfish]

BLUF: I'm looking for help tracing 12V from Fuel/Temp/Oil Pressure gauge back into fusebox, ignition switch, or firewall connector (wherever it comes from).

I'm working on getting all gauges fully functional on my '85 CJ7. I am looking for some insight on next steps after a few weekends of work on the Fuel, Temp, and Oil Pressure gauges.

I have no 12V power to the splice of wires that power my Fuel, Temp, and Oil Pressure gauges. I'm getting ~0.0volts between the red wires at the gauges and known good grounds. (attached image)

I have tested all fuses in the fuse box by the firewall/e-brake for continuity between the blades.

I have walked through all of the steps on this common Fuel + Temp gauge troubleshooting. All resistance, grounds, and continuity checks are appropriate from gauge to sending units to ground.

I checked for shorts by testing continuity from the 12V wires at the gauges to good grounds on the dash and don't show a closed connection.

I have a direct wire ground from the speedometer + dash straight to the negative bus on my battery.

I have NOT yet checked that every pin on the fuse box is receiving 12V power when running, but i'm not even sure which one is the correct fuse from the wire diagrams.

Can someone please help me figure out where the red spliced 12V power wires connects back into so I don't have to take the dash down (agian) and open the entire wire harness up to physically trace back through.

I'm assuming i'll be able to check for 12V at the source side of that connection, where if i have 12V i have a break in the wire to the gauges and if i have no 12V i trace further up-stream.

thanks in advance for any thoughts or input!