Lunchbox adaptor for BMW K - Models

The Lunchbox - Adapter allow the connection of different new speedos on the old harness connector what was connected to the old BMW speedo in older K models. It makes the conversion of the old harness signals to a modern speedo easy. The speed signal is amplified and now compatible to aftermarket speedos. 10 output cables allow to indicate all necessary signals. The neutral signal is now compatible to modern speedos and the virtual load for the alternator is implemented as well. The reserve led for models up to 1985 is flashing when the fuel level is below 7 liter and it is continous on when the fuel level is below 4 liter. For K-models after 1985 is the reserve led flashing when the fuel level is below about 7 liter. An integrated status led indicate the function of the speedsensor, the neutral position and the reserve fuel level. The housing is from a 3D printer and it´s waterproof with epoxy glue potted. 

Connection diagram (pdf)