Tee for installing boost line in map line - Ford Powerstroke Diesel Forum
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Old 10-27-2009, 11:24 AM
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Tee for installing boost line in map line

My truck came with aftermarket gauges when I bought it & they are all hooked up but the boost gauge. The gauge is in place, wiring is done & boost line is run to the engine bay. Just needs to be installed. I think I will go with teeing into the map line but I don't have a tee.

What kind of a tee do I need to get? Will any type of tee do or do you have to get a special one for this application?
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Old 10-27-2009, 11:37 AM
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I typcially get a brass T that has 3 1/8" pipe female fittings on it. The fitting that comes with the gauge will go in the middle one and then you get two 1/8" pipe male to 1/4" hose barb fittings to go on either side. Cut the MAP line and install T and youre set! Don't forget to put some wire loom on the hose to the gauge to protect it and tidy it up.
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Old 10-27-2009, 01:41 PM
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Thanks for the info. Sounds pretty simple but my problem is I don't have the fitting that came with the boost gauge. The previous owner installed these gauges & I never got the fitting from him. Is it the same type of fitting that a mechanical oil pressure gauge has? I assume it is a compression fitting. Hopefully I don't have to buy a whole new guage just to get the proper fitting. It is a Sunpro gauge by the way.
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Old 10-27-2009, 02:25 PM
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You should be able to get that fitting. It's just a 1/8" pipe male to 1/8" compression.
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Old 10-27-2009, 02:28 PM
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Right. I am pretty sure I have seen them at my local hardware store. Should be pretty simple.

Thanks
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Old 11-01-2009, 08:37 AM
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Went to my local hardware store & found some parts to make it work. Got a galvinized water pipe tee ( couldn't find any brass ones), 2 male brass fittings to screw into the tee & a brass compression fitting for the gauge line. Spliced into the map line & it works.

Just one question though. I have never had a boost gauge before so this may be a dumb question but should the gauge be reading something the whole time the engine is running or only when your driving & coming on to her? Mine reads nothing when idling or driving normally. When I get on her the gauge reads from 8 to 12 psi & when I really get on her I have seen it as high as 18 psi. Does this sound normal?
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Old 11-01-2009, 08:52 AM
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Sounds right for a truck that isnt tuned.
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Old 11-01-2009, 09:40 AM
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Thank you.
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Old 11-01-2009, 09:59 AM
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I'd tap it into the intake manifold
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Old 11-01-2009, 10:02 AM
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Why is that a better spot then the map line? More accurate readings I'm guessing. If so how much of a difference will it make?
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