Ignore the above. I plumbed in a cheap boost gauge. With the amal valve plugged in it was running about 4psi. With it unplugged no change. I then measured the voltage going into the amal valve and it was about 5v. A bit of fault finding and i found it was a dodgy earth to it. I rewired a new earth to it and now it clicks fine. The car now boosts about 8-10psi which i guess is standard (everything is standard). Is it ok to leave this earth connected now as it seems to run ok with it? Where is the earth in the loom to the amal valve coming from as id like to sort the wiring properly not just bypass it.
Only thing left with my car now is the hesitation but i will post a new topic.