Oil pressure guage is pegged all the way to the right, any ideas why ? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**57NAPCO** · 02-04-2023, 07:46 AM

Possibly a dead short? The pressure switch is a new (A/C Delco) one, it’s stays pegged and does not move at all, key on or key off, pulled the single wire off…no movement.

Any help would be much appreciated.

1987 SILVERADO, factory original, new 5.7 TBI truck

72c20customcamper · 02-04-2023, 10:27 AM

Sounds like its grounding somewhere. What did it do before the new sensor?

**57NAPCO** · 02-04-2023, 11:01 AM

Before pulling engine and overhaul it worked fine….

**Corts60** · 02-04-2023, 11:04 AM

Quote:

Originally Posted by 57NAPCO

Possibly a dead short? The pressure switch is a new (A/C Delco) one, it’s stays pegged and does not move at all, key on or key off, pulled the single wire off…no movement.

Any help would be much appreciated.

1987 SILVERADO, factory original, new 5.7 TBI truck

Sounds like you installed a switch instead of a sender. The switch is for the dummy light models. If you have a gauge, you need a sender.

**57NAPCO** · 02-04-2023, 12:40 PM

Quote:

Originally Posted by Corts60

Sounds like you installed a switch instead of a sender. The switch is for the dummy light models. If you have a gauge, you need a sender.

Thanks !

Interesting, I will check it out further. I have bought both the switch (installed) and recently bought a sender. The switch screws right into the fitting on the block, the sender is a smaller diameter and will take some kind of reducer….

Problem is I’ve been working on this truck for a couple of years, sporadicly, so I sometimes forget where I left off

72c20customcamper · 02-04-2023, 01:20 PM

What does it do when you ground the wire ? Think I had a fuel gauge workings when I responded . Doesn’t the oil sender peg when it’s unhooked.?

02-04-2023, 07:46 AM	#1
57NAPCO F’B’D guy Join Date: Feb 2004 Location: Texas/Maine Posts: 2,208	Oil pressure guage is pegged all the way to the right, any ideas why ? Possibly a dead short? The pressure switch is a new (A/C Delco) one, it’s stays pegged and does not move at all, key on or key off, pulled the single wire off…no movement. Any help would be much appreciated. 1987 SILVERADO, factory original, new 5.7 TBI truck

02-04-2023, 10:27 AM	#2
72c20customcamper Registered User Join Date: Jul 2018 Location: Catskill Mountains,NY Posts: 8,139	Re: Oil pressure guage is pegged all the way to the right, any ideas why ? Sounds like its grounding somewhere. What did it do before the new sensor? __________________ Mark 72 c20 custom camper Husky edition, 66 SS396 Chevelle 1964 Hawk, 63 Avanti,62 lark 1969 AMX , 1968 c20 stepside ,85 K20 1977 Suburban sold 68 anniversary.

02-04-2023, 11:01 AM	#3
57NAPCO F’B’D guy Join Date: Feb 2004 Location: Texas/Maine Posts: 2,208	Re: Oil pressure guage is pegged all the way to the right, any ideas why ? Before pulling engine and overhaul it worked fine….

02-04-2023, 01:20 PM	#6
72c20customcamper Registered User Join Date: Jul 2018 Location: Catskill Mountains,NY Posts: 8,139	Re: Oil pressure guage is pegged all the way to the right, any ideas why ? What does it do when you ground the wire ? Think I had a fuel gauge workings when I responded . Doesn’t the oil sender peg when it’s unhooked.? __________________ Mark 72 c20 custom camper Husky edition, 66 SS396 Chevelle 1964 Hawk, 63 Avanti,62 lark 1969 AMX , 1968 c20 stepside ,85 K20 1977 Suburban sold 68 anniversary.



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