My speedomter is f@#$%ing with me. It will do nothing and then suddenly decide to work. I disconnected the small (and large for that matter) connector in the spare tire well. I then sprayed de-oxit on/into both ends. I followed this with a blast of canned air and a slight crimp to the female end (small connector)BTW that connector is very hard. My crimp may not have been hard enough. results: nothing

Any thoughts? I know this has worked for some people. However, I know there are other people like myself out there. Any luck yet?

 

I did all the stuff you've tried and mine still doesn't want to work all the time. It only happens occasionally but if I get the speed up, 90+, it will kick in and be good for a long time, sometimes weeks. It must need a stronger pulse or something to make all the connections.
<img src="graemlins/burnout.gif" border="0" alt="[burnout]" />

 

Maybe try and clean the connector where the sensor attaches to the differential?

On the 87 models, the sensor is held to the differential via a clip and bolt assembly - maybe there is dirt between them interfering with the signal pick up?

Just a thought...