I did get an uncut harness with it. Not sure yet if it's everything I need to hook it to the existing harness though, since the car didn't have on from the factory. Got a Linky ??
Had a guy in Seattle rebuild my tach and modify it for use with an MSD. I ended up not using the MSD. The Tach doesn't work as of yet. When I replaced the under dash harness I had to use the wires off the old harness that fires the tach. Given instructions from the M&H tech I spliced the wires into the new harness. That may be my problem. Or, there may be a problem with the re-wire of the tach. Anyway I do have a schematic to direct wire the tach so that may be my next move.
You say you got an adapter with the tach you got? Not sure what that is. My tach is original to the car and it didn't have any sort of adapter. Can you shoot a pic of it?
I'll dig up the info on the guy who rebuilt my tach. There's also a company in Tennessee that knows how to rebuild those tachs.