The 242 in my 93 XJ blew up this weekend and I found one out of a 88 XJ to replace it. I was figuring I could order a fixed output for the rear and a new chain for it and it would be good as new. The only thing I am worried about is whether or not the speedometer pickup is the same on both of them? Does anyone know whether it will be compatible or not? Or if I should find a different plan for about the same amount of money?