flashing CEL and airbag light on 5-speed swap

5-speed install is now complete on my SVX. But I now get a random flashing CEL light while driving and the airbag light is always on. Also my Mechanic can't figure out how to get the cruise control to work. He also couldn't get the exhaust in tight enough because of the tranny crossmember and it now has an exhaust leak. I'm getting the exhaust redone at a exhaust shop monday. We also used the spacer for the driveline from the small car kit. Don't really like the angle it puts on the drivline CV Joint and while accelerating the driveline is rough and vibrates. Has anybody else with 5-speed swaps had these problems and have and suggestions for fixes.