Hello guys (and girls?). I am currently working on a cafe racer project with a 1990 K100RS. I have done most of the work and some minor details is still to be fixed (incl. some of the el.). Really looking forward to hitting the road with my new bike when the sun kicks in later this year. As of why I am here I would like some ideas and help on my build. Currently I am stuck in the gear indicator/start button circuit that needs to be done when replacing with an aftermarket speedometer. 

Wish you all the best and thanks for letting me in

And yeah, if anyone knows where the different wires are going (to where on the bike) when installing this circuit board (Ref. https://www.k100-forum.com/t2856-wiring-an-acewell-speedometer), then all help would be appreciated.

Welcome here!

Interesting project your working on.
Show some more pictures if you can.
Somebody will reply to your question.

Cheers from Germany 

Nice place your coming from

you might be best advised to check with robmac and read this thread
perhaps the led display may not be required ...

https://www.k100-forum.com/t8674-aftermarket-gear-indicator-neutral-indicator-board-3-circuit-fuse-block

but the start circuit operation could be a great advantage

just made or modders I guess

have fun and welcome aboard

WelKome!