bigmatt, this thread was started in july 07 bro!! lol
i have a 94 banshee with b8es plugs and the tach works fine. no problems at all. i have the tach wire taped directly to the plug wire. the rpm's were off when i wrapped it around the plug wire. set the ppr to 2 and i was good to go.
the speedo is pretty acurate too. i set mine by a handheld gps.