94b16coupe

Guys, New here, after searching for a little over a year, I finally broke down and purchased a 71' 240z. After driving it home, I realized the interior gauge lights do not work, and a few other things are a little weird as well. I have not broken the Multimeter yet, but wanted to see what you guys thought, perhaps this is a common issue? Here are the details: Interior gauge lights do not work when opening the door, or switching on the headlights. The dome light, behind my head on the headliner does work. Map light doesn't work, from what I can tell, the cig lighter does not work either. There is a aftermarket radio that I fear as a hack job behind it, it is wired to constant 12v, the radio stays on all the time. I have checked all the fuses, all of them appear to be solid, however I have not ohmed them out yet. The passenger headlight is very dim, drivers headlight seems fine. I did a little searching, and this may be caused by the combination switch correct? The brake lights work, as well as the turn signals (although the turn signals seem to be a very weak pulse when on, barely noticeable.....is this normal for these cars?). license plate light also works. Clock doesn't work, although this is quite normal from what I have read so far. Gas gauge seems to be just above half way mark when the tank is full, I suspect a floater issue, possible gauge issue....worth mentioning though only because it appears to be part of the electrical circuit. Amp gauge works, oil pressure gauge works. Tach is from a 280z from what I was told, all calibrated etc. I realize this is a lot of info, and every situation is different when it comes to electrical gremlins, but any advice you guys have based on common problem areas would be appreciated. Thanks again, Keith