Get whatever kind of tach you want. They all work the same. Mine's an Autometer only because I picked it up from an electric store for $25. It's supposed to be $100 tach.
Like they said, only a few wires. Two grounds, one headlight switch so you can see it in the dark, one to the cap, and one to switched +12v.
Yes, you can install a tach in a vehicle with distributorless. You just have to tap into the computer somewhere. You can pretty much put a tach in anything, you just need to know how to do it.
Tim
'84 Chevy K10, lifted, loud, fast, and 3/4 ton axles