I am still having issues with this gauges but have found that i have a short somewhere as my Tail.Park fuse blows as soon as i put it in the little fuse clamps - I believe this will affect the gauge lights. so i guess i have a more serious issue somewhere.. I have had a look at my tail light globes and connections, cleaned them, and then unplugged them to start testing for the short and when i put in a new fuse it blew straight away again.
I also had a aftermarket look wired in from the tail light loom, but I've removed that and put the loom back to normal... and yet she still blows.
I'm wondering where else should i be checking for shorts in this circuit? I've downloaded a wiring schematic but its for a '74 260 and mine's a '76. Also reading these hurts my head..