I love my '97 Montero ... it has 321,000 miles on it ... all by me.
Recently, the tachometer does not function. Most of the time it registers "zero". Sometimes, after driving for a significant period of time, the tachometer functions ... turn the engine off & the tach fails to respond again.
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I just solved this problem on my 1997 with 183K miles . First I checked all of the following:1) sensor on distributor; 2) wires from distributor to back of instrument cluster; 3) connections of wires to instrument cluster; 4) 4 screens going through the soft circuit board to tachometer; 5) the SOLUTION- I removed the tachometer from the instrument cluster and looked at the hard circuit board of the tachometer. On one side there is a plastic square housing about 1/4 x 3/8" soldered to the circuit board that has a plastic screw facing out. it was lose, so I tighten it and now my tachometer is OK. A simple test to check for this type of an error is hit your dash when the tachometer is erratic. if you see a fluctuation based on the tap on the dash you either have a lose connection of some type like this one. Fix is easy, once you have the instrument cluster out you only have to remove the four screws on the back of the cluster holding the tachometer in place. Remove the tachometer carefully and tighten the plastic screw being careful not to over tighten.
2005 BUICK LESABRE TACHOMETER DOES NOT REGISTER WHEN ENGINE IS RUNNING. SOMETIMES IT BARELY MOVES, THEN GOES BACK TO 0
SAME CAR HAD SPEEDOMETER QUIT, REPLACED WITH NEW SENSOR, DROVE ABOUT 1300 MILES AND IT QUIT AGAIN. CLEANED THE SENSOR, WORKS OK NOW.
On the 03-06 Trailblazer instrument clusters this is a common problem. It's caused by a failing stepper motor on the cluster's circuit board and can be repaired. Check out this page for more about how to get it fixed and other common cluster problems with the Trailblazers - Trailblazer tachometer broken