this may be dumb but gauge clusters are interchangeable between digital and buttstuffog clusters right?
They are, but not a direct plug and play. There's a process to swapping them. I wish I had full digi instead of my buttstuffog gauges, but, I have them, so I'm stuck because I am NOT going to go through the steps to do the swap. I hate electrical anything. I do it, but I hate it. More will chime in on the swap for details.
If you can look at colors, use a soldering iron(not necesary but a good a idea), and have digital with buttstuffog, oil/gas,etc gauges it's pretty straightforward. If you have the full digital i think you have to change out a few senders.
And if he's going from buttstuffog to digital, there are other things that are needed. I don't know what all, but I know the fuel flow wire isn't there for the built in tripminder if you have buttstuffog gauges.
ive got the digital speedo with buttstuffog fuel and such, it had an aftermarket tach when i bought it but i managed to break it somehow so its been removed and has the harness chilling up inside the dash in case i need it again, do the buttstuffog tachs on these cars run cables or could i use that harness to run it
It's a wire that goes to the coil.
I swapped in an buttstuffog cluster into my white '88 car, ran the wire for the tach myself.
If you've an auto car, just punch a tiny hole in the grommet where the clutch cable goes and thread through that. Nothing to it. It's more work to swap the wiring on the cluster connector than running your tach signal wire.
There's a great writeup on coolcats.net as well as Carm's site, and I think there may even be one somewhere here as well :)
If you still can't find the diagram, I have it saved in PDF, I can email it.