Where is the oil pressure switch located on a 1987 ford ranger with a 2.9 L engine

In the past, I was working on a different vehicle, it had a small melted place on top of the piston, had so much crankcase pressure, it blew the pcv valve out of the valve cover and blew oil all over the engine and under the hood. I'm not saying you have a melted piston, I don't know? I would check crankcase pressure.

ck the inertia switch located on the foot wal under the carpet

If your gauge is not reading pressure and your engine is not making all kinds of noise while its running than I would bet that the oil pressure switch is bad.

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look by the oil filter ,most senders leak when they go bad ,but not always

The Oil Pressure Switch is on top of the engine, in the following location:


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In th 80's manufacturers changed from using 10W30 to 5W30 as a recommendation for engine oil. Your truck would likely have enough mileage on it by now that you should consider moving up to a 10W30 or 10W40. Mileage in the area of 250,000 or more could probably handle 20W50 in the summer without problems, but at least 15W40.
If the truck is in good shape, body and mechanical, and not using a lot of oil then a shift to synthetic may prove to be a wise idea. It does cost more but needs to be changed less often and will extend the life of the engine. At least 10W30 would be a good place to start with synthetic.
A good investment would be to purchase an after market oil pressure gauge so you can see what your engine is doing. They are easily installed. Pressure should be in the 30PSI range and this would give you a better idea if the new oil is doing it's job. Hope this helps.

there are 2 fuel pumps, a low pressure in the tank and a high pressure on the frame rail. the high pressure pump is probably bad. Check your relay and inertia/cut off switch first.

most oil sending units are located on driverside rear of engine block or located right near or at oil filter

It should be pretty close to your oil filter.

The oil switch is located on the passenger side of the truck in the back of the engine. Look for the transmission dipstick, then feel for it between the transmission dipstick and the engine block. It is hidden pretty well, but a socket wrench will fit to take it off. The new part uses a 1-1/16 socket, the old part for some reason was smaller, I think 13/16 inch. Hope that helps.