Hello again I was wondering how to remove the sesor unit out of the rear so that I may check as i am having problems with the speedometer. Is it a turning operation or do I need speciao tools ??
My speedo is fluctuating and i want to remove and check it/

Thanks Folks

It is held in place by a single hex allen head screw (metric).

Randy

It is? Where is this hex screw located. All is see on my '86 740 is some sort of ring that the sensor is mounted in and it is all grunged up, and is in so tight that you couldn't get it out with dynamite. I've even tried it at the junkyard after removing the whole diff cover, and no luck. so, if this hidden screw is the culprit where is it?? P.S Import: a prelimiary check would be to check the wires as they tend to break. Then I believe that an ohm meter at the two sensor terminals should read appx 3000 ohms if the sender is good. A misadjusted Vane clearance could cause an intermittant signal or 'jumping' if the sender is positioned too far away for the Vane. Had my brick for almost year now, and never had a speedometer.
Just can't get the damn sender out. My take is to get a whole diff cover w/good sender at the junkyard and swap the whole cover over and hope it is in the correct
position in relationship to the Vane to function properly. Just am not looking forward to a day bathing in stinky old gear oil. But a new diff cover and sensor will run you about a hundred and a half, as opposed to a five dollar junkyard alternative that should work fine. Now, how to get the damn thing out!!!!!!!!!!!!!!

740man '86 740

Sorry, for the confusion. I was referencing from a 1990.

Randy

The later speed pick ups are held in by two Allen head screws. The early cars use the retaining ring (like your car has), which can be very difficult to remove.