my tach has a black button on the back and has a slot for a flat head screw driver to go in but there is know numbers for me to read what pos it is in.Is that what it is for and how do i set it to pos 6 if there are know numbers?
so gaugeguy, do you think that mine is not a fixed tach? have you ever seen a tach with no numbers? does this little black dial with a slot in it sound as though it is the position adjuster, or a calibrater?
A couple manufacturers use a label on the back of the case instead of having numbers molded into the case, the label may have fallen off. If your tach is a single range changing the switch will have no effect on how it is reading. If the tach reads higher as you move the switch counter-clockwise it is more than likely a rangeable tach. If you cant feel the switch lock into place and it turns semi-freely it may be a potentiometer adjustment (fine tune) for tach calibration as Mike suggested.
