I need help to calibrate my speed sensor.  I tried to use the info the previous owner had written in the book.  It said the speed cal #4 was either 1313 or 313  It is hard to read.  I measured the distance of 1 tire revolution to be 131 inches.  The tire has 4 magnets in the rim.  Is my cal 131 or 131/4=32.75.  The tires on the machine are 11.2r24.

Thanks

Paul