Referencing that picture, I'd have to put a 45 in between the tap and the gauge. I assume that wouldn't be enough to affect an accurate pressure reading hey?
In a perfect world what I'd really like to do is run an 8" line or so from the tap and make a mount for the gauge using the two side by side bolt holes on top of the timing cover for the pressure gauge. Not sure how much that would affect readings or not. Being in the neighbourhood of 60 psi I doubt it would make much difference. Easy enough to do a comparison and test it out I suppose.