While perusing the forum, I found several posts on using a rear oil sender. Advantage, easier to the run wiring or tubing to gauge. Disadvantage, lower pressure reading. There was a link on several posts but that link is no longer good, unless you are looking to buy a new Buick. So, is this a mod which can be performed without using the external oil feed line to the rear of the block? Is it worth it to run the pressure at the rear of the block instead of the front? If there is an advantage, how is it done? If not, thanks for your time.
You would need to prepare for it by fitting the line while the engine is not attached to the transmission and you will likely need to drill a hole through the bellhousing mating area to get the line to the outside of the bellhousing. Value is subjective. It will tell you the lowest oil pressure your engine is seeing while the front tells you the highest.
I did it. Drilled a 5/8" hole in the webbing on the top passenger side of the block, ran a -3 AN braided hose (with a rubber grommet to prevent chafing), and a 90° stainless fitting NPT to -3 AN. So, I have the light up front and the gauge off the back. I like knowing the lower pressure. And I glance at my gauges every few seconds (habit drilled in to me over 50 years ago).
You CAN read pressure from the rear if you want, it’s more plumbing and drilling, plus IF it leaks in time (it will) it’s going to be a bitch to repair. I did the mod to my 350, ran two gauges, one front, one rear, last I had the engine out, I removed the rear set up, it was weeping oil. Too many fittings and joints to leak.
Thanks. I wasn’t sure how it would be set up. If I was building an engine for the track, this might be something I would incorporate. But I can see the potential from issues.
Run it to the front....it will most likely be a touch lower in the rear...no need to see it imo...waste of time imo..just something to make you worry ha
