Alright... feeling dumb.... made a few calls... there is no Speedo/Odometer cable on the 87 300SDL...

Circuit board behind the dash is the most likely problem. Easy fix I hear... Speedo place said worst case senerio would be $190.

Guess I can live with that.

Anyone know where I could buy this circuit board?

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Rick
Safety Harbor, FL
1987 300SDL 280K