check to see if the cluster is single cam or dual cam... single cam will read something like 115 MPH the cluster needs to match up with what ever car it is going in. if I remeber right if your running SR you HAVE to use the dual cam one. maybe thats the problem... just my 2 cents..lol
Just me
Chris

also I do believe it is 4 bolts under steering wheel. two near the front and two near the base where the thing comes into the car.