I am not sure how you would use a vacuum guage to help diagnose something as you would have to know where your baseline is for a perfectly running truck. I am running a stupid vacuum guage in my NAS v8 cause it matches my other set of guages...it is a "fuel economy guage" so if you try to drive by not going to full vacuum (open throttle) you at least can save .000001 mi per gallon
Steve I am not sure it would make a difference being force aspirated or not on the vacuum side.
Originally Posted by D90user
I'm ordering a boost gauge and thinking of getting a boost/vacuum. I know there should be no vacuum in a diesel but would it be wise to get a gauge that goes both ways?
My thought is it may help diagnose a clogged air filter or restriction in the future...thoughts?