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Unread 07-18-2013, 03:00 PM   #1
gearheadnick
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1997 ZJ 
 
Join Date: Mar 2012
Location: Tunkhannock, PA
Posts: 587
Question about adding a mechanical oil pressure gauge

At some point in the next couple months I plan on adding some gauges and fabricating an A-pillar gauge pod. One of the gauges I want to add is an oil pressure gauge. The stock electronic one does work, but I'd like to have a real gauge as well. Can I put a brass t-fitting or something in front of the oil pressure sender and tie in the mechanical gauge there, or is there a better place to install it?

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Unread 07-18-2013, 08:37 PM   #2
just_urd
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1998 ZJ 
 
Join Date: Feb 2013
Location: Whittier, California
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Not sure about a mechanical gauge into the stock gauge, if that's what you mean. I wouldn't run a mechanical gauge period... Friend of mine had a mechanical gauge fail at the connection inside the car, hot oil showers...
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Unread 07-18-2013, 09:09 PM   #3
zjosh93
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I run a mechanical gauge on my turbo car. Just put a brass T fitting between the oil pressure sensor and the filter adapter. The trick to making it safer is to use -4 braided stainless AN line. The stuff I use is Teflon (PTFE) lined and is good from -65 degrees to 400 degrees and up to 3000 psi. You are looking at probably $50 for the aluminum ends and up to $100 or so if you go with stainless fittings.

Do not use the nylon or copper stuff at the parts store. I've had that stuff break.
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Unread 07-19-2013, 03:49 AM   #4
gearheadnick
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Location: Tunkhannock, PA
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Alright, sounds like I can use a t-fitting. I've used the nylon tube style gauge on other cars with no problems (chevy small block v8's are easy to plug into). The trick is to be real careful with the tube. One kink and it's done.
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Unread 07-19-2013, 07:08 AM   #5
zjosh93
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Yep just a regular t fitting, they make them in a male-female-female version so you only need one piece.

The problem with nylon is that it gets brittle. It's the same stuff they made all the vacuum hoses out of and I think we all know how randomly brittle that stuff can get. The oil pressure plumbing has to deal with hot used motor oil as well. I had a nylon line break while I was driving. It broke about a foot from the engine where it made a nice gentle bend and was about a foot from anything else (old 67 F100 nice big engine compartment). But my biggest problem with nylon is that the compression ferrules that come with most the nylon kits are not the right kind for hard nylon hose so they twist when you tighten the fitting and cut into the hose. They work, but for how long?

The copper tube work hardens like crazy. Especially under vibration and heat cycles. It'll just crack.

Like they say, you pay your money and you take your chances, but for my money and piece of mind I'll either run braided stainless lines or bend up some double flared steel lines.
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Unread 07-19-2013, 03:40 PM   #6
gearheadnick
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Location: Tunkhannock, PA
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Well that's something to think about. I'm sure that I'll be able to track down a good deal on some good lines.
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Unread 07-19-2013, 04:52 PM   #7
dnuccio
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either that or use an electric gauge with its own sending unit. alot easier IMO but a little more expensive
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