I'm still at it trying to fix my speedo. It shows I'm going like 30mph while I'm at idle. The mileage goes up and if I give the car gas (at idle) the speedo revs with the tach. I've checked all the grounds and even added some. I'm not sure where to begin or what to try next. Its driving me crazy. Also, my PFC shows the same thing, so I dont think its an issue with the whole gauge cluster.

 

Sounds like a bad speedo sensor in the transmission if your PFC is showing the same since it is a resistance based sensor.. I'd get under there with a multimeter and check it out.