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dealer might be able to fix with the computer diagnostic tool. If there is a push button to reset odometer you can take a small wire and try and feed through the hole and raise needle above the pin. removing the instrument cluster cover is a pretty big task, if you cant find a place to insert a wire, only bypass I can suggest is drilling a tiny hole in the instrument cluster cover off to the side or top wherever the hole is least bothersome to you and then use a wire to raise above pin, after put a little clear silicone or a piece of tape over the hole to prevent dust building up inside the cluster
Phylspilot, my 86 Spider never displayed less than 10 mph. If you look closely, you should see a tiny pin that the needle touches at about 10 mph. That prevents it from ever falling to zero. The needle will not move up until the speed exceeds 10. From my experience, that is normal. In your case, not displaying >20 is NOT normal.
The problem could be a few different things. Since the odometer appears to be working ok (I assume you checked that it racks up the miles at a rate commensurate with your approx speed), the speed needle may be sticking. I had the opposite problem with mine - speed needle okay, and odometer messed up.
I recommend pulling the speedometer housing out of the dash and checking to see if anything is causing the needle to bind. If it isn't, then check the fine spring where the needle is attached to ensure the spring is okay. You should be able to move the needle with your finger smoothly and have it return gently to the start position (in your case 12 mph).
This is a tricky operation. If you remove the needle from the stem, carefully place it back on the stem. Do this without moving the stem. Just reinsert the speed needle on the stem exactly at the small pin that holds the pin at about 10 mph.
Check the entire speedometer housing for cracks. Any crack could be enough to prevent proper operation. (That was the source of my odometer issue.)
Push and hold in the speedometer odometer button turn the key to almost starting the car when needles start moving release button wait for the needles to return to original position then turn off the key.
This is an easy fix. Turn the key off. Press and hold the trip odometer reset button. Hold it until you see the odometer light up and it will say "soF" and a number. When you see this then let the trip odometer button go. The cluster will enter into a self test where all the lights come on and all of the gauges sweep. When the self test is complete then your speedometer will be back on the correct side of the peg and will work again.
Unfortunately my instrument panel did the same then the tach stopped working and gas needle became stuck...I had to get a new instrument cluster which set me back $700.00 including labor(Miami, FL)...NOTE...the odometer's computer is on the cluster and the odometer's reading has to be downloaded to the new instrument cluster.
loose connections would not cause it to stay at 20 when your going zero. i think something is stuck and the needle isnt moving freely. sometimes the sticker that have the numbers on it can fall away from the cluster and rub on the needle that why sometimes when you apply pressure to the trip reset it will work. the needle and odometer are also connected so once you fix the needle the odometer will work again. i would take the cover off the cluster and move the needle with your finger and feel if it sticks any where. if it is the sticker just drop a little sper glue down there, move the neelde forward and hold it down till it drys. if nothing appears to be holding it i would blow a can of air in by center of the needle to get any debris out of there.