Chevy 350 oil pressure sensor thread size

07-28-2016, 01:14 PM

Registered Truck Offender

Table of Contents Show

What thread pitch is a GM oil pressure sensor?
What is the thread size on a oil pressure switch?
What size is the oil pressure sensor?
What tools do I need to change my oil pressure sensor?

Join Date: May 2008

Location: hells training ground (aka Ariz)

Posts: 3,113

Re: Mechanical Oil pressure gauge thread size. Not 1/8" npt

I Should have read honomonkeys post a little closer (and researched my own junk beter!) My LS1 has had the hole above the oil filter adapter drilled and taped for 1/8" NPT,,Apparently that's common, bu tNOT stock.

The computer port at the back of the block is what he's is asking about hu!!. So first my LS1 has the computer oil pressure sender in the top back of the block. I think you will need that for your computer,, or maybe yu have some other ECM that is taking care of that differently.

SO top back of the block where your going right? and apparently it IS NOT standard NPT

BUT you have the adapter and are looking for the tubing. I believe it's just standard 1/16 tube. You probably should cut that end off and and get a new ferrell and cap for the 1/16" tubing / to 1/8" NPT fitting (THAT should screw into the adapter you say you have already) But if your ECM is going to want oil PSI,, you might consider moving the stand alone gauge to the oil filter deal

Search LS1.com and you'll find many threads on that. Here's just one that popped up in a search

http://ls1tech.com/forums/new-ls1-ow...il-filter.html

__________________
Still playin with trucks, even at my age!

When you're dead, it's only a problem for the people around you, because you don't know you're dead.
.....It's kinda the same when your STUPID.

I just did my taxes and reviewed my SS statement. Thanks to the current administration it looks like I will only have to work till noon on the day of my funeral.

Last edited by Marv D; 07-28-2016 at 01:19 PM.

BigR

Premium Member

Joined May 13, 2010

797 Posts

Discussion Starter · #1 · May 30, 2015

Does anyone know the thread size of the oil pressure sensor for an 07 3.7L I want to install a tee and put an oil pressure gauge in also.

Joined Apr 24, 2009

13,734 Posts

Check out this thread...
http://www.355nation.net/forum/i4-i5-engine-drivetrain/38362-oil-pressure-gauge.html#post1120652

The hole specifications for the oil pressure sending switch are:
Thread: M16 x 2.0-6H
Thread Depth: 16.0 mm full thread
There is a 45 degree chamfer 2.8 mm deep to accomodate an O-ring
If someone really needs the detail GM drawing, I can fax them one or I may be able to E-Mail it.
Somewhere I saw an adapter that sandwiches between the oil filter adapter and the filter itself that has two threaded holes (probably US pipe threads) on the side. I think some of the gauge suppliers sell them. That may be the easiest solution. That way you could still keep the idiot light sensor in its original location.

Here's Dan's 3.5L setup. I suspect the 3.7 is the same.

Use the port 90° to the front of the truck from the stock sending unit. It's an M16x1.5 thread. You can find adapters M16x1.5 to 1/8NPT online or at autoazone. I also used a 1/8NPT elbow to turn the sending unit towards the passenger side.

BigR

Premium Member

Joined May 13, 2010

797 Posts

Discussion Starter · #3 · May 30, 2015

Thanks Rich, I'll look at mine when I get back home in the morning. I must have missed seeing that spot Dan used. If it is there on mine bingo!

What thread pitch is a GM oil pressure sensor?

The oil psi thread adapter features a 1/8-27 NPT female thread for the gauge's sensor and a 16mm male thread that installs to the LS engine. The included o-ring ensures a leak-free connections between the sensor and engine.

What is the thread size on a oil pressure switch?

NPT are 27 threads/inch and BPST is 28. They are almost interchangeable and as long as you can get a turn and half past max hand tight on it, it should seal with a high quality, high temp, automotive grade teflon tape.