I installed a 1999 cobra cluster into my 2000 V-6 model and the car would not start. so I took the original printed curcuit board out of my car and installed it on to the back of the cobra gauge unit. The car starts OK now but the speedo reads about 30 MPH faster than the original gauge. Will they be able to re calibrate the cluster with that much of a differential, and does it have to go to a Ford dealer to do it?