Submitted By: Billnourse
Put two O rings on the big part of the gauge. I use the top O ring to reference the bottom edge of the chrome belt guard on the Heritage. On the Softails, the belt is deflected on the top part of the belt, rather than the bottom.
Measure 3/8" to the second O ring. This will give the distance you want to deflect.
Put the gauge on the belt with the top O ring even with the bottom of the chrome belt guard.
Compress the gauge to 10 lbs. Adjust the belt until this deflection results in the second O ring being even with the chrome belt guard.