You don't necessarily need Gami injectors to run LOP. It depends on how well matched the current injectors are. I manage a Panther Navajo & run it LOP in cruise as standard. It runs fine at 50 deg LOP although fairly quickly becomes rough once more than ~60-70deg LOP (not that it's worth going that lean. Too far off the efficiency curve)
Its manual approves 50 deg using just the factory single point probe although I had the owner fit an EDM 760 to it before doing so, other than a single demonstration of fuel savings & lower temps to show him the difference. I'm just not comfortable operating close to margins without being sure that each cylinder is OK. Interestingly, the EDM probes showed different cylinders were more limiting for EGT & CHT than the factory fitted probes. Not that they were outside limits but certainly closer. With the EDM I can make sure every cylinder is comfortably cool.