innermusic wrote:Should I be calculating brew pressure or backwash pressure? (About 1/2 bar difference on my machine.)
If you don't know gauge accuracy, you're adjusting blind. When the gauge 'ages', you may adjust needlessly.
Lot's of experimenting w pressure, not profiling, many years ago led to the conclusion pressure is not crtical.
As Chris says, trust your taste.
PM me if you want borrow my gauge. You pay shipping & insurance. Both ways. .75kg