Erratic Tachometer or No Tachometer For all of you with 3rd generation trucks where the tachometer is bouncing or just showing true values, you need to continue to read on here. The reason for poor tachometer performance is caused by the lead-free solder used on the cluster printed circuit board. Tools Required #2 Phillips screwdriver T15 Torx screwdriver Fine Tipped Soldering Iron Total Time for Repair 1 to 2 hours Removal of the Instrument Cluster The knee bolster needs to be removed first