[88911coupe]

I'm having a similar prob. Called a guy in Austin who really seems to know Porsche speedos and in my case I think I screwed up a diode (b31?) when I was taking the speedo in and out and accidentally may have gotten the wrongs wires to touch of the mess of speedo wires in the dash hole. More of an FYI to others to be very careful when pulling all those wires off. I'm going to send it off to be checked/fixed. I was never able to "test" my sensor (or it's dead) since I could not get any response doing the tests mentioned in another thread.. I'm pretty sure my sensor is okay since it seems unlikely that it would fail at the same moment I'm fiddling around with the wires behind the dash but the speedo guy says he'll test it first to see if it's working properly.