Johngarner1960, based on the indications that you are seeing, it is sounding like your instrument cluster is on the way out. With that being said, you are most likely going to need a new instrument cluster, but you may get lucky and simply need to remake a solder joint. You would need to pull the instrument cluster out of the dash and where the main harness comes into the cluster, take a look at those solder joints and see if you can spot any with a black ring in them (normally centered half way up).

The other thing you can try is start with the car off. Press and hold down the TRIP button on the turn signal stalk. With the TRIP Button still depressed, turn the key to the RUN position (do not start the car). Keep the TRIP button depressed. After about 3 seconds, you should see the message center say "ENGINEERING TEST". At this point, release the TRIP Button. Now, tap the TRIP button one more time. You should see all of your gauge sweep from their low point, to their max point, and then back. Watch your speedo and see if it operates smoothly. If you see it not going to max speed and/or it seems jerky, then this would confirm a sticking speedo. To get out of the test mode, simply turn the car off or hold down the TRIP Button for 3 seconds.

 

Kind of disappointed in this thread. When I first saw it I thought someone had found a Jaguar X-Type bathing suit...........................

 

Lmfao!

 

Hello John, whenever you are experiencing inaccurate speed readings its always one of two failed parts. I have found that the culprit is usually the speedometer cable and not the speedometer itself, which would be good news for you, as the cable is a fairly straightforward repair and requires less labor.

 

Sorry Greg, no speedo cables on an X. X's use speed sensors. Shouldn't comment if uninformed.