This is going in circles.
1)First, get a whole cluster from an MJ or XJ. Get it from an 87,88,or 89 to be safe. Get the one with a TACH and all four gauges.
2)Make sure the connector on the speedometer is the same as yours. (white plastic or aluminum)
3) to be safe get one from a 2.5 liter.
4) Go to your favorite parts place and buy a temp sensor and oil pressure sensor.
5) Go ahead and buy a speedometer cable and grease. Put it in cuz now is the perfect time since you got everything apart.
6) Take an hour of your day and get it done. You'll be much happier :D
7) If you have any questions on the install please feel free to ask. We will only ridicule you if we're extremely bored or outta beer. Good luck :D