I installed an Autometer boost gauge in my S14 with a S13 redtop in it along with a Greddy ProfecB Spec 2 boost controller and the two of them read out different boost pressures. The only thing I can think of is maybe I have the boost gauge hooked to the wrong hose? I have it spliced in with a T-fitting off the BOV, is this correct? If not, where should it go? Also, I just bought an Autometer oil pressure guage (not the electronic one), and I was wondering where I tap into to hook it up. Thanks a lot.

 

i had my boost guage hooked to a T fitting the went on the vaccum line from the throtle body to the fuel pressure regulator never had an issue maybe give that a try

 

Any vacuum source on the intake manifold will work for the boost gauge. For oil pressure, take off the stock oil pressure sending unit, which is right next to the oil filter, and replace it with the fittings that came with the gauge.