Firefly
Active member
Not sure about the Gates, but it is similar to the NAPA gauge. Not much to it. Put it in the center of the belt run (running lengthwise with the belt), push down on the finger tab until it clicks, read the number off the scale.
Ahhh.. but which side of the moving yellow part does one read for the scale?
I've always assumed the 'top' or 'leftmost' part.
Mine has always been maxed out.. push down to click and nothing has really moved. Going to take it with me to Cuba and check against what they adjust it to.