When you purchase this from Boxer Metal it comes with 30 minutes of free Tech Support.This is a $45.00 value.
 
This is by far the easiest way to clean up the wiring & control every aspect on your BMW 2 Valve Boxer from turn signals, horn to starting.
 
The most powerful, cleanest solution to wiring your Airhead!
 
Are you building a custom, café, tracker, bobber?...or just want to update a restoration & the wiring has seen better days? Instead of modifying the original wire harness or building a crazy spaghetti mess, use the revolutionary R21. The extensive feature list of the R21 will satisfy even the most discerning builder.
 
Dimensions: 94mm x 82mm x 21mm
You can use the original BMW factory control switches on all models pre 1990!
Retain the stock BMW handlebar controls,
No need to use aftermarket switches, new throttle tube, clutch and brake assembly. 
Works with all aftermarket momentary switches like the Motogadget or Rivival switches
Simpler and better availablity thn the Motogadget M unit.