0 mph speedometer

I took my 89 turbocab out, going to the gym, perfect day top down yada yada... After a nice workout I leave and the speedometer is not reading anything. The only thing that happened was.... just sitting in the sun with the top down. Any suggestions as to what or where to dive in. I figure this can't be that big of a deal.
thanx david

Were you moving when you noticed the problem?

j/k, couldn't help some levity.

I'd start by checking the speedo cable where it attaches to the tranny.

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Mark Szabo
1986 911 Targa 3.2