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Coming soon: Lunch Box Adapter 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. The adapter makes the conversion of the old harness signals to a modern speedo easy. 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.

Update 18.12.2018: The fuel reserve indication is integrated for all models before 1985. We have turned the con 13-24 for a better cable guide

Update 18.2.19: We have solved a software buck in the neutral circuit.

Update 26.3.19: Wefound out that a few speedos and tachs work not well in combination with the BDA, We work on it...

Original connector describtion (pdf)

UVP: 114,-

51 mm x 51 mm x 15 mm w/o connectors
Body material:
abs, 2k potted, water resist
JST 12 pin inputs, 0,14 qmm output to Speedo
Maximum temperature:
90 degree Celsius
Input voltage range:
8 - 15 Volt