A boost gauge/vacuum gauge will not tell you anything unless you have a boosted system... turbo or supercharger. If you do not have one of those, then your engine is only creating vacuum, period.

In no way will that gauge give you an idea of power gains without boost. A turbo will give you about 10-11 HP for every lb of boost it is running. That is the only way you can tell HP gains from that gauge, and in that case you should already know that you gained power cause you have to turn the boost up yourself.

I'm not knocking on your install or write up, but those types of mods are really only beneficial to high revving vehicles, that have a powerband beyond the Jeep motors. i.e. my honda prelude redlines at 7500 RPM's. Peak power comes at about 5000 RPM's all the way through to 7200 RPM's.

Mods like that in fact do increase power, regardless of what others might think, but they are just not as useful in our Jeep applications as they are in others. My 2ó