Thanks MJ, having never looked at these in detail I'm just intrigued as to how it all hangs together.
I can understand that there has to be input from the shifter to the TCU - Tip+/- for a start, and the kickdown switch and probably many other sensors/controllers.
Presumably there's a link from the TCU to the gearbox (valve body?) to issue commands to change gears etc. does that have a feedback/control element too?
When you say "Mechanical Mode" do you mean just PRND (and maybe S/4) or also 3 and 2, which the F125 is theoretically capable of signalling?
Just wondering how/if the TCU knows when the gearbox is in First gear...… 
As for the cluster, presumably FL2 has a different bitmap or coding for the gearbox display vs FL1 as it has more options to display, so it's hardly surprising it gets confused and gives up.
I don't imagine the developers ever considered providing cross-compatibility either way between FL1 and FL2 TCUs and FL2 and FL1 clusters!
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2003 D2 FL S8. Irish Green Pearl/Beige. Solar sunroof, auto-dim mirrors, electric rear seat functions and extended leather. Ski hatch retrofit. Aftermarket reversing camera. DVB-T and XCarlink now removed as redundant.
2016 Volvo V40 T5 Cross Country (4WD) with ALL the toys including adaptive cruise etc. etc. Osmium Grey with Blonde/Charcoal leather interior. Polestar performance "optimisation".  (Even rarer than a D2 S8!) Oh, and a brand new engine at just under 30,000 miles on the factory one! 
Finally: gone, but not forgotten.....
1998 D2 PF S8. Agate Grey/Platinum. Every option (I think) except electric rear seats, Tiptronic steering wheel, ski hatch, towbar & dimming door mirrors.
e.g. Cruise control, NavPlus/TV, Bose, GSM, Xenons, Solar roof, Parking sensors, Alcantara/leather everywhere of course.  (internal dimming mirror added later)
1998 (very early) Ford Focus 1.8 Zetec; ABS/TCS, Heated screen/mirrors, Aircon. Added Auto-dim mirror, Leather seats, Trip computer, Cruise control, OEM Ford SatNav with CD changer.
And before that a lot of Rover 800s, a few oddities, a lovely Triumph Dolomite 1850HL with Overdrive and way back in my schooldays an Austin Seven aka Mini 850!
Last edited by HPsauce; 4th September 2020 at 01:10 PM.
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