My spoiler is a modified P1 spoiler
The twitchy temp gauge is probably another side-effect of the DIM failing.
If the ETM isn't playing-up (lumpy idle and major flat-spots while driving round town are the big giveaways) then don't worry about it - it's probably been changed. Have a look at it, it's easy to tell them apart - the Marelli one is big and square, the bosch has round bits and has a visible bosch logo.
From your description, it seems like you have an unusually good example of an early P2 car. I would happily spend the money on a new DIM, knowing what I know now.
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