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Ended up buying a different gauge pod, the one that Tweaks sold me was just getting more and more butchered, and still looking less likely to fit.
Ended up getting a "Pro Gauge" one from local chavvy emporium. I know the guages who run it, and asked if I just pop out to the car with the pod to test for fit, and some cans of grey spray to find a close enough match to the vinyl.
The pod almost fitted like a glove straight off, and needed minimal trimming, and with all three being inline, not sticking out, they were easier to get into the space I had.
And I was suprised to find that Hycote Rover Hurricane Grey was a perfect if a a little glossy match to the vinyl.
Going to look at what I need to dismantle/break to get the illumination wiring and boost plumbing in, and maybe if I'm lucky fit the sensors for the oil temp and boost.