My 1356 simply grounds the bulb.
I have no idea how the various indicator lamps are lit up in a PSOM cluster, but I'd imagine that you could change out red lens and the bulb socket should have power in run.
Jim,
Lil'Red is a '87 F250 HD, 4.10's, 1356 4x4, Zf-5, 3G, PMGR, Saginaw PS, desmogged with a Holley 80508 and Performer intake.
Too much other stuff to mention.