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Old 05-14-2008, 11:32 PM   #1
Scooby Specialist
Member#: 116052
Join Date: May 2006
Chapter/Region: MWSOC
Location: IL 수바루!
2011 STI ( Sold )

Default Defi racer oil temp and pressure gauge thread type


I can't seem to find clear answer for my question..
I am looking to buy 52mm defi racer gauges for oil temp and pressure.
The vendor carries only imperial units which is F* for temp and PSI for pressure. That is fine. But for the install, What I found here is that all Defi pressure gauges are 1/8NPT and temp gauge can be either 1/8 PT or NPT based on either F* or celcius.

I need to verify this for the gallery plug that I need to buy...

Defi manual on their website says its all 1/8PT..and some says pressure is 1/8NPT...

So i want to hear from people here who actually running it..
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Old 05-23-2008, 10:39 PM   #2
Team Scream
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Member#: 121532
Join Date: Jul 2006
Chapter/Region: SCIC
06 FXSTi, 06 FXTAT
06 STi Wagon, 99 GF Wagon


The pressure sending unit has a 1/8-28 BSPT (British Standard Pipe Tapered)
The temp sending unit has A 1/8-27 NPT (the american version)

Subaru part # 11024AA210 is the stock front gallery plug which will fit your PRESSURE sending unit.

is a part (adapter) that will allow you to put the TEMP sending unit in Subaru gallery plug if you want to.

I also hear that some people actually put the temp sending unit into a 1/8 NPT threaded bung (welded) into the oil pan for more accurate readings.

Or you can use this method:
which is a oil drain plug with a 1/8 NPT threaded hole in the center for you to place you sending unit in.

And finally you can use a sandwich adapter at the oil filter for both sending units BUT you will still probably need http://www.sfxperformance.com/cart/cart.asp which is the same adapter I mentioned above.
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