2004 ESCALADE ESV; SPEEDOMETER AT ABOUT 70,000 MILES BEGAN TO GO HAYWIRE, SOMETIMES STICKING ON 0MPH OTHER TIMES ON 140MPH. AFTER A FEW DAYS OF THIS IT STOPPED WORKING ALL TOGETHER. I TOOK THE CAR INTO A DEALERSHIP FOR AN ELECTRICAL ISSUE AND TOLD THEM TO PLEASE LOOK AT THE SPEEDOMETER BECAUSE ITS NOT WORKING. THEY REFUSED TO FIX IT SAYING IT HAD MORE THAN 70,000 MI...THAT WAS 2008 AND IT HASN'T WORKED SINCE. I ESTIMATE MY SPEED BY THE TACHOMETER (NOT SAFE)...ORIGINAL BROKEN PART IS STILL INSTALLED...I AM THE ORIGINAL OWNER OF THIS VEHICLE. *TR