Steering Wheel Mounted Push-Button Gear Change for Citroen Ami : Build, Fit & Test

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Visit my website https://dougsshed.co.uk/home/citroen-... for 3D Print Files for the Steering Wheel Mounted Button Housing and the Raiser Block for the existing gear change button panel.
The gear selector buttons on the Citroen Ami Electric Quadricycle are in an awkward position, down by the left side of the driver's seat. It is difficult to reach and impossible to see without taking your eyes off the road. By placing a set of gear selector buttons on the steering wheel, this makes for a safer and more pleasant driving experience.
The steering wheel mounted gear selector buttons are connected to a 433MHz 4-channel radio transmitter which is battery powered. The buttons mount to the side of the steering wheel's centre cover and the transmitter and battery are contained inside this cover.
The radio receiver for the gear change are contained within the existing gear selection box down by the left of the driver's seat. The 433Mhz receiver is connected to 3 miniature, 3.3 volt relays which are connected in parallel with the existing Drive, Neutral and Reverse buttons. The receiver and relays get their power from the Ami's existing wiring and the voltage is reduced from 12v to 3.3v via a small voltage regulator module. All the wiring for the receiver, relays and regulator are "plug-and-play" with the existing wiring harness and gear selector buttons. To accommodate the extra components into the space under the gear switch panel, I added a 3D printed, 30mm high, spacer under the panel.
Most of the components are readily available and are very cheap.
The green and brown 6 way wiring harness plugs, which plug into the existing switch panel, were a bit difficult to source and I had to buy quite a few to get the benefit of a minimum order value.
Mating halves for the 6 way plugs are not manufactured as they are intended to plug into pin headers with bespoke housings. So I 3D printed suitable socket housings so that I could use the 6 way plugs in break-in cables. The receiver module and the relays were built onto 'strip board' and hard wired.
The 12v power to the 3.3v regulator was taken from my break-in cable between the existing harness and the switch panel.
The idea for this project was inspired by ‪@amistyle42‬