redsc400, I built my own system to meet all my needs. Turns on warning light if P drops, turns engine off if drops too far and will pressurise system before start up no matter how long it sits between start-ups. I had a solenoid built to my spec's and I use 2 pneumatic pressure switches for control. The first set 25 psi turns on red warning light and actuates solenoid to subsidies
oil supply to engine. If pressure does not increase or if it falls to 15 psi then second switch removes signal to fuel pump or ignition if running a mechanical pump killing engine while pressure from reservior continues to feed engine until it stops saving engine from more damage.
The engine can only be restarted by holding a bypass switch. You need this to restart after fault repaired or an
oil change with new
oil and not pressureized. The key is the solenoid for all these features. Mine does all this automaticlly. You can do this with cheaper ones but they leak back into system and I found out if you let her sit for 1 to 2 weeks it has lost pressure with the cheaper sol.
Has 1 connection or # 6 line to engine and mounts behind front wheel near the side louver area. The electrical connection is very basic also. I have built a few kits for friends and a few for race cars. Put 1 on my Dads RV and it sits for long time between start ups but always working great.