Ok so My pressure sensor is out on my 87 T2 and it got me to thinking about the unit numbers on them.

Mine is listed as 318 (i think, its very worn), and I beleive that the ones for the 88 are 326

My 91 turbo uses 370 and I'm pretty sure my 91 N/A uses "boost sensor" 350

so which are compatible???

Im guessing that 318 and 326 are compatable because of the S4 similarities. How bout 370? can I use it in place of 318? or 326 instead of 370?

I know that the N/As and Turbos are different, but how different are the units between series?

 

Basically none are compatible with any others. S4 and S5 are different, NA and Turbo are different.

 

So my 87 Turbo cant use a sensor from an 88 turbo. or my 91 n/a cant use one out of a 89 n/a?

That seems weird.
I understand the S5 to S4 thing and the N/A to turbo thing but the others seem strange.

 

I didn't say anything about individual years, just S4/S5 and NA/Turbo.