The speedo and the Cruise Control work from the speed sensor that is located
in the differential. Look at the diff and you will find a pair of wires
coming off, these are the speed sensor.
If the cruise works properly, but the speedo is dead, then the speedo is the
This is certainly true. The odometer can't work unless the speed sensor is
I doubt that simple stuff like a stone will harm the wires to the speed
sensor. I suppose that road salt and crap like that can cause troubles
relative to corroding, but if a stick or stone was going to take the wires
out, surely this would be a driving event worthy of rememberence.
The instrument cluster is all driven by electronics, and there are assorted
ground points that can cause intermittant problems. I suspect you can remove
your instrument cluster and turn it over a few times to look at it, perhaps
replace a few bulbs inside, and put it back in and it will work properly
again for many years. The good news is you will have fixed it, the bad news
is you won't know why. My guess is the connections are faulty, and
disconnecting and reconnecting them will fix the troubles.
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