really new to the supra

[suprra_girl]

wow.. you have a few little quirks huh :P

i would suspect that since your dash lights and interior etc aren't working you have a blown fuse in the kickpanel... check the fuses and replace if necessary

check all the plugs in the engine bay to make sure they are plugged in... oil pressure is on exhaust side of block almost at the front, you might be able to see it if you peek between the intake pipe and manifold at the top
temp gauge is the top one on the side of the thermostat housing, the one pin spade plug (not the green two pin plug) just check the wires and make sure they're good
gas gauge... hmm that's a new one heh... does your fuel light work? if not... try unscrewing the metal plate located in the boot/trunk right rear.. 3 screws and make sure both plugs are plugged in

radio harness... how far back is it cut? can you see any of the colours?