2005 Chevrolet Blazer

MY 2005 CHEVY TRAILBLAZER HAS A BAD SPEEDOMETER. IT FAILED WITH 20,000 MILES ON IT. IT WILL READ 120 MILE AN HOUR SITTING STILL, THEN IT WILL READ 30 MILE AN HOUR, WHILE I AM GOING 60. IT IS TROUBLING AS TICKETS ARE EXPENSIVE IF I RECEIVE ONE. ON THE INTERSTATE, YOU HAVE NO IDEA HOW FAST YOU ARE GOING. HAS NEVER BEEN IN AN ACCIDENT. GM SAYS $800.00 PLUS TO FIX IT. ONLY HAS 39000 MILES ON IT NOW. THOUSANDS OF THESE HAVE THE SAME PROBLEM. COMPLETELY UNSAFE. THE WHOLE ASSEMBLY HAS TO BE REPLACED TO REPAIR TO FIX IT. *TR

2005 CHEVROLET TRAILBLAZER 4WD 1. CHECK ENGINE LIGHT STAYS ON CONSISTENTLY 2. WHEN DRIVING AT NIGHT THE HEADLIGHTS AND INSTRUMENT LIGHTS WILL DIM AND/OR FLASH ON AND OFF. 3. WHEN STOPPED THE VEHICLE WILL SUDDENLY REV WHICH HAS HAPPENED MANY TIMES AND FORTUNATELY I PRESSED THE BRAKE IN TIME OR I WOULD HAVE REAR ENDED SEVERAL VEHICLES. 4A. THE GAUGES ON MY VEHICLE ARE COMPLETELY HAYWIRE. THE SPEEDOMETER WILL AT TIMES NOT MOVE AT ALL OR GO ALL THE WAY PAST 120 MPH, AT OTHER TIMES IT WILL STICK ON WHATEVER SPEED I MIGHT BE GOING AT THE MOMENT AND NOT MOVE. OTHER TIMES IT WILL STICK AT WHATEVER SPEED I WAS GOING AND THEN PROCEED TO MOVE WHICH MAY SHOW I'M GOING 10, 20 30, .... MILES FASTER THAN THE ACTUAL SPEED I'M TRAVELING. 4B. THE OIL GAUGE HAS GONE ALL THE WAY OVER AND NO LONGER MOVES. THESE ARE ALL VERY DANGEROUS INCIDENTS WHICH SHOULD BE RECALLED