The oil pressure sending unit is on the drivers side of the head, its supposed to be there from the factory. I can;t remember the pressures off the top of my head you will have to check a bentley.
hey Rat, I've just hooked up my sending unit to the side of my head and i get 1-2 bar at idle. Gauge reads 0-5 bar. and goes up to 4 bar when i nearly full throttle it.
Most have oil pressure. Glad to hear you have that great of pressure on a hydraulic head. I might try to find a 0-10psi gage and hook it up and see what I get. I might be reading at least 1 to 2 psi just that this gage doesn't read that low. Oh well it has been running great and I got just about 1k miles on it now.