As above, was okay for 400 miles after fitting.
But now this happens as regular as clockwork..... Drive 10 miles everything OK. Leave car to stand 30 mins. Set off and boost gauge has no reading, i.e. needle at -30
2 miles up road gauge springs to life as normal.
Not electrical prob. as gauge is lit and does its "ceremony"
So is it vacuum prob?.... Have replaced T piece and clipped connections.
I have placed the sender unit near the inner wing, could it be heat soak whilst car is standing that is prob.