I feel your pain. See if your check valve is plugged though like you think it is. That'll be a BIG ASS relief if it was a plugged check valve rather than a messed up map sensor.

I like where you placed the fuel pressure regulator. Who's the mfg. on it and did it come with the kit?

Did you tap your oilpan for the oil feed or did the kit come with one?

 

Shipping from by post is amazingly quick. 2-4 days.

The VC1 and ESM are very similar. Connection is +12V, 0V, MAP signal in, MAP signal out.