Electrical Issues??

The other day I jumped in my 2000 F250 7.3 diesel as I always do, the speedo wasn't working, the ABS light was stuck on and the Overdrive light was flashing.  So I jumped out checked fuses and gave it all a once over but now she sits on the driveway.  The tuck has a Banks Stinger system on it.  I recently had to replace the turbo and during diagnostic the dealer here had me remove the Banks chip and they reset the computer. I have not reinstalled the chip yet.   Anyone have any ideas what mey be going on???

Check the rear speed sensor mounted in the differential. Is the signal for the speedo and a speed sensor for the ABS and PCM.

Thanks for the info. The speed sensor was the culprit and all the good info from FordForum.com got me back on the road in no time.

Glad to be of help.