Here is your post from the other site. So its not just your speedo correct?
"I have a 2003 Lincoln LS V8 with 120XXX miles. Im having a problem with my speedometer working. There are times that my speedometer will work and times that it wont, but it chooses not to work more than actually work... When it works, the car runs great, no problems and not lights are on. When it doesnt work, ABS, Traction, Park Brake light, and Check Engine light are all on. On the message center, Service Park Break, Check Transmission, Check Traction Control, and ETC Engine failsafe mode are on. Now here is the other thing i dont get, From what i read, ETC Engine Fail safe is a "Limp" mode in which the car wont go over 20 mph and have no power... well in my case, i can go 70-100 mph.. but i have no power.. the transmission will shift at 3500rpm even if i have the pedal all the way down."..