What's that sensor near the oil filter

Second hand truck.
I was changing my oil and noticed a switch near the oil filter.
It was totally rusted (Ohio) and the wire had rusted off.
I'd like to replace it, but I don't know what it is. I thought it
might be the oil pressure sender, but the diagrams that I have
seen show the oil pressure sender on the front of the block, not
on the side near the oil filter.

2000 Tacoma, 3400 engine.

Thanks in advance.

 

Picture?

 

Photos:

 

It is the oil pressure switch I venture your oil pressure light never comes on! If the wire is broken

I have my oil pressure gauge in there .

 

Wyoming do you have a picture of your setup you can share?

 

I will try and remember to take one for you.

Being I still have the leftover mindset pictures require sending or taken someplace to be developed then printed I just never got in the habit of taking pictures.

Not real sure just what a picture will show but a fitting ( mechanical gauge ) with a 1/8" copper tube inside a rubber vacuum line for protection towards the front of the engine from the oil filter.

 

Found this picture on the internet (not my truck).

 

As you can see fitting and copper line in front of oil filter

Metric Adapter to pipe thread allowing the use of a compression fitting

That is the location for the oil pressure switch that turns the light on and off when your oil pressure has dropped to the to late now area.

 

Thank you for posting. Great information

 

I could see looking at some manuals one could get the idea that switch is on the front of the engine

From the diagrams I have seen.

 

Thanks! I really appreciate all of the help.

 

That's pretty neat that you ran a line with a mechanical gauge to get an actual PSI reading. Oil pressure loss is a rare event, but do you have any in-cab notification for it? I've had two pressure-loss events in my truck's lifetime: a cracked block and a lost oil pan plug (5 miles down the road after using an oil change service). The first instance obviously led to an engine replacement, but the second I was able to pull over in time and shut'er'down before damage occurred.

 

You might say that I do.

Depends what your back ground is oil pressure loss is very critical more so on 500 horsepower engines $$$$$ seconds can mean the difference between a engine and a boat anchor .