Rally Dash Wiring Harness Questions

The 71 Dart book I have shows the limiter being fed by G1-18BK, and it junctions in the harness with EG the flasher (not necessarily PHYSICALLY at the flasher) and ends up Q2-12BK at the ignition, which is accessory

The oil warning lamp which WOULD BE "ignition run" fed is fed by G5-18DBL, AND THAT IS WHAT I'D USE for gauges and anything else switched power to the cluster

That wire junctions "somewhere" into the J2 circuit which IS YOUR ignition run buss. DBL (Dark BLue) is for many many years "the standard" for ignition power

Again, with that you can feed the brake warning lamp, the IVR power for the gauges, and anything else in there that you want on/ off with the key