Matt's VFR Page
Gear Indicator
The gear indicator tells me what gear the bike is in, including neutral.
This reminds me to use top gear on the highway and helps me when down shifting to a slow corner or stop.
LEDs Installed in dash The LEDs are installed in the dash by drilling holes equal distance apart across the top bezel.
A bead of silicone retains the LEDs and seals the electrical connections.
Schematic An Arduino Mini Pro is used as the controller for the gear indicator.
I had ordered a 5 Volt unit, but a 3.3 Volt unit was shipped.  I was planning to used the VCC out from the Arduino to power the Hall Effect sensors, but 3.3 Volts is too low.  This necessitated the LM317 Voltage Regulator and associated circuitry.
Sensors The Hall Effect sensors are mounted on a fibre board that is in turn mounted between the water pump and the output sprocket cover.
The magnet arm mounts to the shifter shaft inside the shifter.

Since this picture was taken, the 1/8" magnet was replaced with a 1/4" diameter magnet and a steel cover plate with holes (or "windows") was placed over the Hall sensors to improve performance and allow some distance between the magnet arm and the sensor plate. 
Sensors Installed The sensor mount plate, painted black and held in position with slightly longer bolts on the water pump and the front sprocket cover.