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When I was driving my stang this morning I noticed the speedometer was on zero and the odometer just read - - - - - - -. What would cause this? The SpeedCal?
 

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open the speed-cal and see if all the parts look OK.

--Brian
 

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Yes, the SpeedCal can cause this. Check the connections to the SpeedCal, check the fuse for the aux power socket or make sure it is still hot. And as Brian said make sure to take a look at the unit (his died violently recently...). If you cant get anywhere drop me a PM or email. I designed the SpeedCal for DMP.
 

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i had the exact same problem and it was becasue the power line to the speedcal got cut. simple fix and easy to diagnose.
 
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