I just hooked up a vacuum gauge in my '94 4x4 22re 5 spd. I tapped into the pcv valve. I noticed that when I'm cruising down the road at 60 mph in fifth gear on level ground and very little wind the gauge is reading quite low (between 5-10). I think it was closer to 5 Hg. What does yours read? I'm wondering if I have a vacuum leak or some other issue. Anyway, I'm glad I got it nevertheless.