oil pressure wiring 5.3 truck engine - The 1947 - Present Chevrolet & GMC Truck Message Board Network

rustycars63 · 08-27-2018, 06:44 PM

1949 chevy truck , 2005 5.3 engine what wires are used to hook up oil pressure gauge. Does this go thru the pcm ? This is a truck engine and harness, blue and green pcm. Thanks in advance.

65blackfleetside · 08-28-2018, 01:19 PM

No at first I thought the same thing as you..... My after market BP harness did not come with a wire that went to the oil pressure sending unit. and I was confused. thought something was wrong?

Someone on the forums here explained to me that The ECM only needs factory temp sensor. ECM does not take oil pressure readings. Put your aftermarket oil pres sender in the center of top rear of block- up against the firewall in the OEM port. Be careful that port is a metric thread so your new sending unit must have a metric conversion on it. I believe it is M-12 or M-14 Unscrew the stock sender- GM uses a special socket that can be purchased on amazon to remove this.
LS 5.3 ECM does not read Oil Pressure just temp for cooling fans. You will need to screw an additional temp sending unit in passenger rear head for your aftermarket temp gauge.

rustycars63 · 08-28-2018, 02:21 PM

Thanks for the information, and the fast response, will keep working harness.

**mongocanfly** · 08-28-2018, 07:41 PM

autometer makes a metric to sae adapter for the oil pressure sender...

**michael bustamante** · 08-30-2018, 01:15 PM

subbed

Andy4639 · 09-04-2018, 12:04 PM

I have all the mechanical gauges hooked up and also use the scan gauge 2 hooked up to the ECM for all the LS stuff.
The oil gauge is the mechanical one.

LH Lead-Foot · 09-04-2018, 01:18 PM

The "LS" truck engine oil pressure signal is 5 volt signal back to the PCM and can be seen on a scan tool, but not need. Use the metric to 1/8" NPF adaptor as posted above, sold everywhere.

If room is limited, the other popular method to get a old school sender into your "LS", is the oil cooler block-off plate, located over the oil filter. When removed, it can be drilled and run a 1/8" Nation Pipe Thread tap into it to install your sender.

Route your new wire, being careful to hold it with wire loom clamps to keep away from the header heat. I wrapped mine in HVAC foil sold at home improvement stores. Same with O2 sensor harnesses. Also used with ground shielding on PMG signal sensor circuits like speed sensor.

Others, have used the OEM oil senders metal base, broke off sender, drill and tap. Note; Sender requires the block for ground using one wire for gauge. Do not use pipe thread sealant or pipe tape. Only GM thread sealer P/N 12346004 will allow sealing and grounding. I have two tubes in the tool box. Otherwise, naked as pipe thread is tapered and will tighten to seal.

08-27-2018, 06:44 PM	#1
rustycars63 Registered User Join Date: Aug 2015 Location: Ruidoso New Mexico Posts: 52	oil pressure wiring 5.3 truck engine 1949 chevy truck , 2005 5.3 engine what wires are used to hook up oil pressure gauge. Does this go thru the pcm ? This is a truck engine and harness, blue and green pcm. Thanks in advance.

08-28-2018, 01:19 PM	#2
65blackfleetside Registered User Join Date: Nov 2015 Location: Central Florida Posts: 215	Re: oil pressure wiring 5.3 truck engine No at first I thought the same thing as you..... My after market BP harness did not come with a wire that went to the oil pressure sending unit. and I was confused. thought something was wrong? Someone on the forums here explained to me that The ECM only needs factory temp sensor. ECM does not take oil pressure readings. Put your aftermarket oil pres sender in the center of top rear of block- up against the firewall in the OEM port. Be careful that port is a metric thread so your new sending unit must have a metric conversion on it. I believe it is M-12 or M-14 Unscrew the stock sender- GM uses a special socket that can be purchased on amazon to remove this. LS 5.3 ECM does not read Oil Pressure just temp for cooling fans. You will need to screw an additional temp sending unit in passenger rear head for your aftermarket temp gauge. __________________ current ride 1951 AD Chevy 5 window 2004 LS Gen 3 [/B] 1965 fleetside Sold

08-28-2018, 02:21 PM	#3
rustycars63 Registered User Join Date: Aug 2015 Location: Ruidoso New Mexico Posts: 52	Re: oil pressure wiring 5.3 truck engine Thanks for the information, and the fast response, will keep working harness.

08-28-2018, 07:41 PM	#4
mongocanfly Post Whore Join Date: May 2015 Location: Alabama Posts: 14,583	Re: oil pressure wiring 5.3 truck engine autometer makes a metric to sae adapter for the oil pressure sender... __________________ Mongo...aka Greg RIP Dad RIP Jesse 1981 C30 LQ9 NV4500..http://67-72chevytrucks.com/vboard/s...d.php?t=753598 Mongos AD- LS3 TR6060...http://67-72chevytrucks.com/vboard/s...34#post8522334 Columbus..the 1957 IH 4x4...http://67-72chevytrucks.com/vboard/s...63#post8082563 2023 Chevy Z71..daily driver

08-30-2018, 01:15 PM	#5
michael bustamante Senior Member Join Date: Sep 2007 Location: Albuquerque NM Posts: 7,814	Re: oil pressure wiring 5.3 truck engine subbed __________________ 1967custom

09-04-2018, 12:04 PM	#6
Andy4639 Old member Join Date: Jan 2002 Location: Liberty, & Garden City S.C. , U.S. Posts: 19,936	Re: oil pressure wiring 5.3 truck engine I have all the mechanical gauges hooked up and also use the scan gauge 2 hooked up to the ECM for all the LS stuff. The oil gauge is the mechanical one. __________________ 1971 LWB Custom, 6.0LS & 4L80E, Speedhut.com GPS speedometer & gauges with A/C. 20" Boss 338's Grey wheels 4 wheel disc brakes. My Driver Seeing the USA in a 71 Upstate SC GM Truck Club 2013,14 and 2016 Hot Rod Pour Tour http://upstategmtrucks.com/ Get out and drive the truck this summer and have some fun! It sucks not being able to hear! LWB trucks rule, if you don't think so measure your SWB! After talking to tech support at Air Lift I have found out that the kit I need is 60811. Per the measurements I gave them. Ride height of truck inside spring and inside diameter of springs.

09-04-2018, 01:18 PM	#7
LH Lead-Foot Registered User Join Date: Jan 2018 Location: Omaha, NE. Posts: 214	Re: oil pressure wiring 5.3 truck engine The "LS" truck engine oil pressure signal is 5 volt signal back to the PCM and can be seen on a scan tool, but not need. Use the metric to 1/8" NPF adaptor as posted above, sold everywhere. If room is limited, the other popular method to get a old school sender into your "LS", is the oil cooler block-off plate, located over the oil filter. When removed, it can be drilled and run a 1/8" Nation Pipe Thread tap into it to install your sender. Route your new wire, being careful to hold it with wire loom clamps to keep away from the header heat. I wrapped mine in HVAC foil sold at home improvement stores. Same with O2 sensor harnesses. Also used with ground shielding on PMG signal sensor circuits like speed sensor. Others, have used the OEM oil senders metal base, broke off sender, drill and tap. Note; Sender requires the block for ground using one wire for gauge. Do not use pipe thread sealant or pipe tape. Only GM thread sealer P/N 12346004 will allow sealing and grounding. I have two tubes in the tool box. Otherwise, naked as pipe thread is tapered and will tighten to seal. __________________ Removed



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