Where do I hook up a mechanical oil pressure gauge?

WHITE03SILVERADO

MEMBER
2003 CHEVROLET SILVERADO
6.0L
V8
4WD
AUTOMATIC
325,509 MILES

I need to know where I can drill into the aluminum block at the end of my oil cooler lines that mount to the oil pan on my Chevrolet lq4 so I can plumb in a mechanical oil pressure gauge.

Tuesday, September 25th, 2018 AT 12:02 AM

5 Replies

DANNY L

MECHANIC
5,648 POSTS

Hello, I am Danny.

Just a suggestion. At the rear of the engine, on the top is the oil pressure sensor. You could take sensor out and replace with a Y-type pipe fitting and put sensor back in and plumb in a mechanical gauge as well. Just an idea instead of drilling. Hope this helps and thanks for using 2CarPros.
Danny-

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Saturday, September 29th, 2018 AT 10:07 PM

WHITE03SILVERADO

MEMBER
3 POSTS

I did that but I question the gauges accuracy in that location. The oil pressure switch is designed to electronically send the message from its reading in that location but the mechanical guage is based on PSI in the line attached.

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Sunday, September 30th, 2018 AT 9:26 AM

DANNY L

MECHANIC
5,648 POSTS

Hello again.

I have attached two pictures. If you follow the Upper cooler line from radiator (circled) to the adapter block that mounts to the pan that will be the pressure side of the two. Hope this helps. Thanks again for using 2CarPros.
Danny-

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Sunday, September 30th, 2018 AT 9:23 PM

WHITE03SILVERADO

MEMBER
3 POSTS

Thanks I figured the return line would be the best place to get a reading
it made more sense to measure the oil pressure going into the motor rather than the pressure of the oil leaving the motor.

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Sunday, September 30th, 2018 AT 9:56 PM

DANNY L

MECHANIC
5,648 POSTS

Hello again.

Yes, you would get a higher P.S.I. Reading under pressure than at the return. Hope this helps. Let us know how things work out. Be careful when drilling/tapping with the shavings. Thanks again for using 2Carpros.
Danny-