Something I haven't reported yet, but made some time ago, is the gear select mechanism. I realised that the front ashtray made an excellent spot for the controls. (The two little screws in the lower RH corner are to hold the ashtray cover fixed.)
The buttons connect to a little circuit which is mostly just a PIC micro. The software is set up so that neutral is the default, one push of green engages 'forward', two pushes of red engage 'reverse', and any button push whilst in a gear takes one back to neutral. The circuit connects to the Driver Controls Unit.
The gear state indicator LED in between the momentary-push buttons is tri-state, red for reverse, blue for neutral and green for forward. It is controlled by the Driver Controls Unit.
The other recent job is just a small re-working. I found that the electronic pressure gauge I had planned to use was a bit delicate for the purpose of indicating low vacuum, and so I bought a more robust vacuum switch through KDRyan.
This is marked 3"HG, which, when translated into civilised terminology, means it closes when the pressure is above 90kPa, and opens below 90kPa (or when there is less than 10kPa of 'vacuum'.)
The reservoir is made from 100mm Ø PVC pipe with end-caps. The Wasco vacuum switch for the purpose of indicating low vacuum, as required by NCOP14 §1.3 (ADR 31 \& 35), is on the right, and behind it is the activating switch for the pump. There is a little circuit designed to keep the pump running for about three seconds after the switch opens, consisting of a capacitor, diode and comparator.
The Wasco switch is on the right.