When you say you don't want a 'cutout', I assume you mean you don't want it to shut the engine down. Regardless, it's not difficult to wire up one without spending a lot of money on a system made by Murphy or some other mfg., and even easier if you don't want to incorporate a shutdown function.
Basically all you need is a switch that is NC at whatever pressure you want the alarm to come on at, and open above that. I usually use one that closes around 5 to 10 psi.
Put the switch in line where it senses the engine oil pressure. You'll feed power to the pressure switch with a positive wire attached to a circuit that has power on when the ignition is on. The feed from the pressure switch will then go to the alarm, light, or both that you decide to use to indicate the low oil pressure condition. When the engine oil pressure rises, the contacts open, and it will break the circuit so the alarm will stop. If oil pressure drops below the switch setting, the contacts will close and the alarm will sound.
Without a lot of extra wiring the alarm will indicate low oil pressure until the engine builds pressure, which should be before it starts.
If you decide you want a shutdown function, post back and I can explain the wiring on that setup also.
I tried to find a switch available through NAPA, but their site is nearly impossible without a model number for a vehicle. If they get in the Ecklin book they should have no problem finding you what you need. If they can't, post back and I can look in my book and find you a part number.
You can also wire a temp switch in on the coolant to alarm for high engine temp, if needed, without a lot of extra effort.
Here is a link to NASON's site. They make just about any switch you might want if you want a little higher quality switch.
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Today's Featured Article - Hydraulics - Cylinder Anatomy - by Curtis von Fange. Let’s make one more addition to our series on hydraulics. I’ve noticed a few questions in the comment section that could pertain to hydraulic cylinders so I thought we could take a short look at this real workhorse of the circuit. Cylinders are the reason for the hydraulic circuit. They take the fluid power delivered from the pump and magically change it into mechanical power. There are many types of cylinders that one might run across on a farm scenario. Each one could take a chapter in
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