Urgh, thanks
@pipsyp that was the response I was dreading but also expecting, I had a feeling it was going to involve a lot of work if it was even possible. I was beginning to consider whether it might go down the route of needing pin-out diagrams similar to hacking into ECUs and while I might have a go at some point out of morbid curiousity I think I'll have to just stick with the stock tacho and embark on a Pi project for an infotainment system.
As a follow-up, do you know if the digital speedometer display on the tacho is tied into the centre speedo? I.e. would the digital display still work if the main speedo was removed, or do we think it might piggyback off that?
Ty for the response either way!