Electrical Trouble

Dang, sorry to hear about your string of bad luck with wiring issues!

electrical is one of them things that can run you for a loop.

Im no expert but I will try to put a few things out there for the heck of it.

has your car been repainted?,if you make sure all your ground points are not sitting on top of paint....scratch the paint off and reinstall.

check all grounds and make sure they are good.

check all the wires at the bulk head( wiggle them and see if there is any difference in your issues).

make sure under dash grounds and column ground are good.

make sure all fuses are good.

make sure the main positive and negative wires that run to the back left side ( I believe) of your gauge cluster are making good connection as these are what feed power to your entire car.

make sure your voltage reg checks out and your starter relay.

make sure you are getting good connections at your relay.

you said your car acts like it does not even want to crank now and I am assuming this you came to this conclusion by turning the key.....but you may want to try arcing the terminals at the relay with a screw driver which will send direct power to the starter and will tell you if your starter is taking a crap or your relay or the wiring from the point of the relay to the point of the starter ( if you have headers its not uncommon for a starter to take a crap from the added heat stress)......if the engine whips over with no problems like normal by arcing the relay with a screw driver than that will tell you the problem is somewhere else .

luckily older cars wiring was basic ( compared to vehicles of today that is LOL) so hopefully you can get it figured out with out to much of trouble.

by the sounds of it though you may have had a voltage spike ( or voltage drop)in your system that stressed out a bunch of different components....now its just a matter of pinpointing the problem and fixing any faulty equipment.

ALSO I believe there is a voltage regulator in the gauge cluster itself but I am not positive what all this regulates so i will let someone else chime in on that ( can't remember if it is gauge specific related or if it is tied into the rest of the electronic system )

I hope I was able to help a little and maybe give you a few ideas......sorry for the long post