N-Track Setback gauge

I built a gauge to help determine track setbacks for N-Trak and and oNeTrak modules. The guage was cunstructed by ripping a peice of 3/4 in. plywood 2.455 in. wide. This peice is the gauge. - I glued and screwed the gauge to a peice of 1/4 in. plywood to make a T shape. On one side of the T I placed 1/4 in. spacer blocks. The other side of the T is left bare. I use the bare side of the T to determine where to begin installing new tracks on a module. I use the side with the spacer blocks to determine where to cut track that is already installed.