Past few days the speedo has been acting a little screwy. At seemingly random times it will drop towards zero for no more then a second, often it doesn't even turn off long enough to reach zero but will drop down and shoot back up to my speed. The speed is reading accurately it just blinks off every so often. It sounds like a loose electrical connection to me. I've checked the power and sensor feed behind the cluster and have checked/cleaned all the fuses with no change. What should I check next?

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Serenity-86' 300SDL 482,000 miles (on a "14" head!)

ground wires.

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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 190D 2.5Turbo
1987 190D 2.5-5SPEED!!!

1987 300TD
1987 300TD
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!

This happened on my 84 300SD.
The cylindrical magnetic sensor that plugs into the transmission
had fallen out. The screw that bolts it to the transmission was missing.
It had been held in there for who knows how long just by its magnetic force.

A super easy fix, indeed.

Jeff