Thanks guys. When I first reassembled it I did the screw driver trick. It actually took quite a long time to get oil pressure like that but it did in the end. So could this be it - opening that pipe opened the system and it needs repriming? I actually just tried to remove the dizzy but seemed like something was holding the shaft in - had about 2mm of up/down then stops (yes I removed the clamp bolt!), is there a trick? I was in a rush so didn't keep pursuing it, should read the manual really...
The thing is I've run it quite a bit, probably about 2-3 hours overall. Oil pressure has always been good so the shaft is obiously mating well and the gauge is good (it's a manual one out of a dodge d5n).
So drill/screwdriver it is.
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