A resistor in the wire, eh? No I used my own wire, I have the '77 and most of the harness is hanging out of it, but I didn't see a plug that fit into the tach so I just said "whatever" and attached them with simple female quick-disconnects. I'll have to see if tach man is reasonable, cuz I would really like to keep the factory gauges I like the way they look and I don't need a friggen 10,000RPM gauge, when it was working I had my truck in 3rd (th700) at 70, floored it forcing a shift change, and I think it got to 4K??? LOL Plus I'm sure his screening would look better than my painting.
Nothing really hard, for the tach. Just cut out a square hole for the prongs to stick out, the factory flexy circuit board actually has a missing square exactly where it should be. The tach also has a support bracket, and the mounts/holes where this attached in the '77 are still in the '90. A little trimming here and there for clearance and it all bolted together as though stock.
The gas gauge was a little harder, there are a bunch of walls over there to seperate 2 idiot lights where a clock normally would go. I just nipped those all out, cleaned it up, and then grafted in a little bit of the '77's cluster box so I had a post to attach it too. Probably could have just attached the post to make it simpler, but I thought this looked better and it provided the squares where those nifty clips attach, though I didn't end up using them and thought I would.
Don't make fun of my crappy paint job, block letters with a brush are hard.
