MS3 Pro Sequential Injection + Coil near plug conversion thread

One thing I noticed is your temp sender on that tee. That might not be a good idea. Let's say you get a slow coolant leak over night, like a weeping water pump. The coolant level might drop enough the gauge won't pick it up rapidly. You want the main gauge sender "where you'' can see it

(the GM "in the head" thing is a much better idea)

There are various places, makes spacers under the T stat housing, might be one approach.

If nothing else, interchange the EFI and the gauge senders

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Also "I wasn't thinking." Is the injector drivers different for the MSII and III? That is would you need the outboard driver module if you was to have used an MSII?