I have a vacuum gauge that I went ahead and added to my gauge cluster. I know what I should see/look for when using it as a diagnostic tool....but I am having trouble finding out what I should be seeing under normal driving conditions. Can anyone help me out here? I know that they have been used before in OEM gauge clusters, but I have never had the pleasure of owning one that did. If I understand correctly, they have been used as "economy" gauges to let you know when you are getting the worst gas mileage. Most people recommend avoiding dips below 10 inches if you want to save gas. This makes sense to me since they are basically an "engine load" meter when hooked up all the time....right? I am just looking for some information of what is "normal" as far as what I should be seeing the needle do when driving normally. Currently, it idles steady at about 19. When decelerating, it goes up in the 20s and comes back down. When "punching" it....it dips pretty low. What should I look out for here as far as what a "problem" would look like under normal driving conditions?