5.9 FI Magnum swap in 73 swinger

If it aint one thing it's another...congrats
For the gauges, did you replace the magnum oil pressure sender with the old one? and what temp sensor did you tie into for the temp gauge?
FWIW I changed over the oil pressure sender to the old style to keep the dummy light and moved the old coolant temp sender into the radiator to use the old gauge. Sunpro mini tach wired just like it was.
Are you running the fan clutch or electric fan(s)?
Did you incorporate a power distribution block into the harness?
...see, I'm goading you into posting more often ;)