On a '89 Pontiac 2.8 V6, where is the oil pressure sending unit located? There is a device on both sides of the block below the heads that look like a sending unit. One has 3 wires attached, orange, grey, & tan and is on the radiator side. The other has one wire and is on the firewall side.

If i replace the sending unit with an aftermarket unit and gauge, do i have to do anything with the ecm?

Can anyone help?

Shorty

Can anyone help

 

no idea, never worked on one, but from looking at the pics in my manual i'd say next to the oil filter

 

Thanks, wish i had the pictures to look at.