oil pressure sender question

[DCx]

how many of you guys drilled and tapped the little cover next to your oil filter for your oil sending unit?

my engine didnt come with a factory sending unit so i need to plug that hole. i asked on ls1 tech what size the hole is in the back of the block and i was asked what i was going to do for a sending unit if i plugged it. from my understanding if you are using a stand alone harness the factory sender is un used.

i ordered 2 oil bypass (cover, tee?) what ever you wanna call it covers from the dealer. here is what i got. think there is enough material to drill and tap to mount my autometer sending unit.

this is next to my autocraft supplied oil filter adapter

[Bow Tie 67]

Yes it should be fine, I removed the oil psi switch at the top and back of the block and used a metric to npt adapter.

[DCx]

someone told me that the switch at the back of the block is a 16 x 1.5 bolt not a pipe thread.

[CarlC]

Correct. It is not an NPT.

The factory ECM does not require an oil pressure input. For me the easiest would be to get an Autometer adapter that into the stock sending unit location that has a small NPT thread.

[parsonsj]

I drilled and tapped that part for 1/8 NPT, and used an Autometer sending unit and gauge. Works perfect.

[WS6]

Same here. I drilled the untaped portion of the factory block off and tapped it for 1/8th NTP and mounted my oil pressure sensor on it.(the C5 mounts the oil temp sensor there stock). I removed the stock pressure sending unit from behind the intake and used an adapter from autometer that allowed me to screw the oil temp sender in place of it.

[DCx]

thanks a bunch. ill get the autometer adapter and run it on the back of the block.

what about the temp sensor in the head? what size is that 12 x 1.5?

[trapin]

I guess I'm not understanding any of this. What the hell is an NTP? What switch on the back of the block are you talking about? Is the oil pressure measured electronically or mechanically? Why both a sensor and a sender?

Confused, I am. Confused.

[parsonsj]

Tony,

NTP = Network Time Protocol.
NPT = New pipe thread.
I'm using the AM full sweep gauges which require a sending unit screwed into the 1/8 pipe thread area on the little thingie pictured above.

jp

[CarlC]

NPT = New pipe thread.

Uh.......

National Pipe Thread.

And, a trivia question, who knows how to tell when an NPT tap has been put in far enough?

[DCx]

here is a picture of the 16 x 1.5 to 1/8 NPT (to replace the factory LS1 sender)



screw this into it (autometer eletric sender)



and finally, the factory LS1 sender (sensor) what ever that its called, its useless and in my case missing.

[WS6]

That giant pressure sender may not fit behind the intake manifold. That's why I put the oil pressure sender down low next to the filter and the temp sender in place of the stock pressure sender.

No idea Carl. All I do is keep testing the fitting I am using until I get it in far enough to my liking. That means with as few thread showing as possible.

Tony. At the very back of the block on top behind the intake manifold sits the oil pressure sending unit. It only supplies info to the factory gauge. It goes into the ECM first but the ECM does nothing with it. Most people interchange sensor and sending unit. They are all sending units because they send the info to a gauge that then deciphers that info and spits it out by moving a needle. Most of Autometer's gauges are actually quite simple in design. If you'll notice, they simply change the word telling you what your looking at in a number of instances. Oil temp, trans temp, water temp. That sort of thing

[BonzoHansen]

and finally, the factory LS1 sender (sensor) what ever that its called, its useless and in my case missing.

Isn't that an OPS used to trigger the fuel pump (and shut down in case of PSI failure)?

[trapin]

Thanks for the info, guys.

Justin, where did you order the oil bypass cover from? I got my AutoKraft Oil Pan yesterday and the billet oil filter adapter didn't come with one. Oh...and does your pan sit perfectly flat on the bottem of your engine? Mine has a slight distortion to it, nothing major, maybe a few millimeters but I just wanted to know if this was normal. Contemplating reusing my original gasket too. A new one is like $60. Damn these LS1's are expensive. LOL!!! Thanks.

[DCx]

pm sent.

[CarlC]

If the gasket sealing bead is in good shaped I would not hesitate to reuse it. I reused both front and rear cover gaskets.

[LS69TA]

Uh.......

National Pipe Thread.

And, a trivia question, who knows how to tell when an NPT tap has been put in far enough?

Isn't that National Pipe Tapered? The tapered threads are what tighten the fittings and cause the seal.
NPS is National Pipe Straight I think.

[CarlC]

You're right.

From the Machinery Handbook.

Thread Designation and Notation.—American National Standard Pipe Threads are designated
by specifying in sequence the nominal size, number of threads per inch, and the
symbols for the thread series and form, as: 3⁄8—18 NPT. The symbol designations are as
follows: NPT—American National Standard Taper Pipe Thread; NPTR—American
National Standard Taper Pipe Thread for Railing Joints; NPSC—American National Standard
Straight Pipe Thread for Couplings; NPSM—American National Standard Straight
Pipe Thread for Free-fitting Mechanical Joints; NPSL—American National Standard
Straight Pipe Thread for Loose-fitting Mechanical Joints with Locknuts; and NPSH—
American National Standard Straight Pipe Thread for Hose Couplings.