Method 1:
	Drill/Tap Existing Oil Journal Plug
	On the top of the engine block, just behind the alternator, there is a threaded hole in the block which allows the screwing in of a bushing and the subaru oil sensor.  I like to add an aftermarket oil pressure gauge and so have a need to add an aftermarket oil sensor to the block.  Subaru has made it very easy to do so by providing an additional threaded hole, identical to the size of the one already mentioned, but this time located back by the egr valve on the left rear top of the engine.  If you can, ask for the same type of bushing that exists on the first subaru oil pressure monitor sensor.  You can use it to replace the plug in the second port and screw in your aftermarket sensor.  Saves you having to drill and tap the stock plug in that second port.

	The stock Subaru sender
	uses 1/8 BSPT and you will need to re-tap the hole for a 1/8 NPT sendr.

Method 2:
	Purchase a bushing
	The three plugs in the oil galleys on the Subaru block are M18x1.5
	threads and the egauges.com bushing part number is R7965 (1/8 NPT
	female x M18x1.5 male) and cost $6.50 each.
	See SubaruVanagon2 > Files > 2.5L Engine–SOHC > 2.5L SOHC Oil Pressure
	and Temp Sensor Placement.GIF .

	Note that there is not enough clearance for the VDO oil pressure
	sensor in the threaded hole with a straight adapter at the flywheel
	end of the block on 2.2L Subaru engines.  It works fine for 2.5 SOHC
	engines.




Other Parts Needed:
	If you do install an aftermarket oil sensor onto your engine you may need to "tilt" the sensor in order to avoid hitting the subaru alternator.  You can accomplish this by screwing a couple of ells into the oil journal bushing and thread your sensor into them.  This gives you the ability to tilt the sensor over toward the left-back side of the block.  Here're a couple of choices of ells.....


	http://www.mcmaster.com/itm/find.ASP?tab=find&context=psrchDtlLink&fasttrack=False&searchstring=50785K82

	Part Number: 50785K82  
	$1.43 Each 
	Shape	Elbow
	Elbow Type Pipe to Pipe	 Male x Female 45° Elbow
	Pipe Size	 1/4"
	Pipe to Pipe Connection	 NPTF x NPTF
	Material	Yellow Brass
	Maximum Pressure (psi)	1200
	Sealant	No Sealant

	OR

	http://www.fittingsandadapters.com/45streetelbow.html
	PartNumber	23350x4
	PipeThread	1/4”
	ListPrice	2.47
	SalePrice 	1.24




Miscellaneous Notes:


	Wiring:
	For '86 and later vehicles, connect the Subaru oil pressure sender output to the VW blu/blk (low-pressure sender wire) on the round, white connector, and ground the VW yellow wire (high-pressure sender wire) on the same connector. Thanks to a special circuit in your instrument cluster, if you don't do this, your oil pressure light/buzzer may come on when your engine is revved over 2000 RPMs. 
	'85 and earlier Vanagons have only one oil pressure connection and thus no such circuit in the instrument cluster. 


	Oil Senders:
	If you're talking about the oil pressure sender, the Subaru sender
	uses 1/8 BSPT and you will need to re-tap the hole for a 1/8 NPT sendr.
	
	
	When purchasing a sending unit for any gauge, remember: These gauges measure ohm resistance which is created by the sender. 
	The ohm range of the sender and gauge MUST MATCH or the gauge will not be accurate. VDO sells many gauges which work with other manufacturer?s senders; but you must know the correct sender ohm range before you buy any of these gauges.
	
	As to the sending units themselves, check out egauges.com
	
	Here's a link to several different types of electrical pressure sending units for vdo gauges:
	http://www.egauges.com/vdo_send.asp?Sender=100PSI_US
	
	
	
	
	
	____________________________________________________________________________
	
	
	
	
	The oil Warning Light Activation Pressure switch specification for a
	2001 2.5L Subaru is 2.1 psi (Subaru Legacy and Outback Service Manual,
	2001 Model Year Engine, Section 2).
	
	The Vanagon low-pressure oil light switch is 0.3 bar  (4.4 psi)
	(Bentley Service Manual).
	
	
	And just for comparison, here are specifications for several other VW
	low oil pressure switches I found in the 1993 to early 1999 Jetta and
	1999 to 2003 Jetta  Bentley Service Manuals:
	
	A3 1.8L turbo gas engine        1.4 bar   (20 psi)
	A3 1.9L turbo diesel engine     0.7 bar   (10 psi)
	A3 2.0L gas engine              1.4 bar
	A3 2.8L VR6 gas engine          1.4 bar
	
	A2 2.0L gas engine  (two low pressure switches specified)
	         Brown                 0.3 bar   (4.4 psi)
	         Blue                  0.2 bar   (3.0 psi)
	
	A2 2.8L gas engine              0.2 bar   (3 psi)
	
	Ed McLean
	_____________________________________________________
	
	  Warren Chapman  to subaruvanagon 
	
	For lurkers to this thread...
	
	It's also worth noting that the larger aftermarket oil pressure
	sender will only fit in the rear of the block location on a later
	model engine like a 2.5L.
	
	On a 90-94 2.2L the IAC valve is in the way at the back, so the big
	aftermarket sender has to be located in the front location with a
	couple of 45 degree 1/8 NPT adapters from the hardware store to clear
	the alternator.
	
	The block adapter/bushing  from egauges.com (part number is R7965
	(1/8 NPT female x M18x1.5 male) sounds like it will simplify the
	process...and maybe allow a better fit by lowering the sender down
	just a bit.  I'm going to order a couple and check this out.
	
	Warren C.
	
	_____________________________________________________
	
	Warren and lurkers,
	
	 Well, this regarding the sender unit not fitting on the rear (flywheel end) on '90 - '94 2.2s may not always be true. It probably depends on which sender you have. I used the Stewart Warner gauge and sender and it fit there just fine using a single 45 degree fitting from NAPA. The SW sender being smaller than the VDO is one reason I chose SW over VDO.
	
	
	 Craig