Just a video showing some testing I was doing today on the Manual HCH1 steering column coil spring and connectors to assess the feasibility of steering wheel mounted buttons for IMAC&C.
IMAC&CHCH1 Steering Wheel Controls.avi - YouTube
Looks like it will be feasible and compatible with the current HCH1 IMAC&C pcb.
The second set of switches should work in parallel with the ones already on the pcb so you would have two sets of switches and can control if from either position.
Basically the pcb will have four flying leads which will attach to the coil spring, feed through the steering column and then connect to 3 buttons mounted on a tiny piece of stripboard inserted under the leather steering wheel cover.
I hope to fit IMAC&C to my car tomorrow, possibly with the steering wheel mounted buttons depending on my button stock and suitability.
Whilst looking at buttons I also considered a trio tactile membrane switch. These are ultra thin and fix by ahdesive to the steering wheel. Hmm.
DIY 5 Pin Connector 4 Key Matrix Flat Membrane Switch Control Keypad | eBay
100x Momentary Tact Tactile Push Button Switch 4 Pin SMD Surface Mount 5x5x1.5mm | eBay
Interestingly the check engine light did not work on my car when I bought it and when I checked the cluster today a previous owner or technician had prised off the CEL led from the pcb in an effort to hide the fact the check engine light was on!!!! That's a cheap trick.