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A dirty test is faster perhaps... Clean off and get dirty under the car. Remove the cable end, attach a drill and turn it on... see if the speedo reads.
behind the cable drive 85' last year for cable that I am aware of the clip can well be broken, and so the cable while near by may not be attached. the clip is a bayontte like mounting you push it much like a medicine bottle before you twist..
This must be disconnected before it is possible to move the instrument pannel, so don't bother to try pulling the instruments first.
jacking the car so the tires are off the ground can work as well. Use stands.
Running the wheels in the air and watching the cable spin or not will tell you where the problem lies...
If it is the speedo chances are slight you can repair it with out spending some time seeing how the gears work, and even then gtting that right is hard to do.
If you do hammer a nail square, and cut off the head and install it to where the cable would be and run that with a drill....
Then it is possible to see better what does not work... often times the plastic gears are a press fit and once they slip, they just slip forever. Some are a friction fit, and telling which is which is tuff to do....
If you succeed and have to pull the needle off it is hard to get the needle back on just so.. Since the speedo does not work you will not know what the drill speed was....
So you then would reinstall the speedo having no better testing method, and see as compared to a known good unit... (your buddies car pacing you) what the error is once the speedo does work...
Say once the speedo works but reads 10 MPH slow... You can then again remove the speedo and set the drill running read that... say it says 30 MPH, and then stop the drill remove the needle, start the drill and set it to 40 for your better setting knowing it was 10 MPH slow..
probably you won't need to or want to do that.. And probably the problem is the gear, or the cable.. Mac
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