Using some 12v LED's such as this in blue I have converted my 6 gauge cluster from its original yellow/orange color scheme (blergh) to blue/green. Also ditching the hungry and dim incandescent bulbs in the process. Apologies for the blurry pic, my phone wouldn't focus in the dark but you get the idea.
I was annoyed to find the yellow filter for the main dials (white numbered areas) is built into the dials and not removable. But in a strange twist of luck, adding super bright blue LED's turned them green, not bad!
while still having blue needles. They look a bit dim in the photo too, probably because there was only 11.8 volts there. With an alt charging the system at a healthy 12-14 volts they should come up a bit brighter...hopefully! If you want to do this yourself, the modern LED bulbs plug straight into the original plastic light sockets which you remove by giving them a little twist from the back of the instrument cluster. You will need the "T10 wedge" type LED's to replace the larger incandescents, and "T5 wedge" for the tiny ones like warning lights, get white ones for these. This works with the standard cluster as well. LED's are polarized though so they only work one way, it is a slow process testing each one after installation to make sure it lights.
I've got every pin and every wire for the 4 plugs in the 6 gauge instrument cluster connected to something. I count this as a huge milestone, since when I got the instrument cluster I had no idea what any of the wires did and the circuit diagram in both my FSM's was completely different to what my cluster had. To celebrate I thought it was time I hooked the battery up again and did another test. (Admittedly) to my surprise, when I connected the earth to the battery post nothing went snap, crackle or pop and no fuses blew! 
No electrical fires to speak of. And as a bonus, everything worked!!! 
Today I trekked over to the north side of town to Subareck and got some really useful bits that I've been chasing for a while. Namely some decent seats, these are out of a Gen 3 outback (I think?) they're not the leather kind but they were the only pair of seats within reach I could find that weren't green from damp 
I've been tidying and tying up the wiring loom, it's nearly ready to be wrapped. Also needed the instrument cluster out for something else. 
All because of one little part that I haven't been able to find which has held up pretty much EVERYTHING else. This little $2 item has caused me so much headache and frustration, searching online for hours and hours for a suitable replacement. But luckily a single spur of the moment trip to U pull it the other day has solved everything. 
