Gauges and cluster light only work with lights on?!

I was just a couple minutes to slow, 67dart273 just said what I was typing up!

May not be related to a direct wiring issue, but while your cluster is out, make sure you remove, clean, re-tighten (or replace) the nuts to the back of the fuel/temp gauges. That was the issue for both my 69 & 71 darts. The gauges were intermittent due to weak connection.

I actually read a bunch of posts prior to all this and checked all the wiring from point to point as 67dart273 has suggested many, many times, haha. He and alot of other guys have great info! Thank you to to them!

Great job on the voltage regulator also. I ended up buying one on ebay for 25, works great.

After I figured out my aluminum nut issue, I decided to take out the cluster again and fully clean everything.
1. Soldered all pins & the 3 slots for the limiter since those are pretty weak areas.
2. Replaced the aluminum nuts with the type that have the star washers attached to grab a bit better. (Got them at Ace).
3. Cleaned all the contact points for the lights. (Used a brass wire brush very carefully).
4. Put a little dielectric grease on all the connections to help with connectivity and corrosion.

Everything works great now!

http://i1218.photobucket.com/albums/dd420/adcowen/20140830_190425_zpsf05ab65d.jpg