so I was pretty sure that both under the dash and engine bay pressure sensors were n318 for turbo models... but I have a n318 in the engine bay and a n326 under the dash.....? is that correct? any help is appreciated. all I could find was stuff on the engine bay sensor.

 

Yes that's correct. The ATP is the same part for turbo and Na.

 

or may be not... did the turbo models look alike but have different model #

I just found another one.

one is n318 8z11
e1t10771*

other is
n318 7100
e1t10771

sorry some moron took all his pressure sensors and tossed em In a box and didn't label anything.

 

the under dash sensor is NOT the same as the one under the hood, it is an ATMOSPHERIC pressure sensor. it has a vented cap instead of a vacuum line nipple.

 

yea that's what I thought. but they are the same in both turbo and na? a n326?

 

fairly sure they are, it's rather rare i work on stock turbo IIs anymore that i can't even remember.

 

I used the N326 atp in my Swap..N318 boost sensor in the engine bay.
ran good!

 

Just curious, does NA cars have this pressure sensor under the dash? I thought it was built into the ECU.

 

on the S5's its built into the ECU

 

yes, all it does is check the atmospheric pressure.

 

Anyone have a picture of an atmostpheric pressure sensor? I have an uncut complete wiring 88tii wiring harness but some of electronic boxes got disconnected and this is the only that i cant ID. Im doing a T2 conversion and redoing the harness from scratch. TIA

 

It sort of looks like the one at the bottom of the page.
86-92 Engine Electrical

Only it is located in the Passenger kick panel area and does not have a hose connected to it,just a connector.

 

I saw that. Identical to a boost sensor (marked 318 also) but without the vacuum port. As I said, I'm making my own harness, saving the uncut 88 tii harness (complete from headlights to taillights) for my SA's Tii smog legal conversion.