I installed a vacuum gauge in my car last night. I didn't use the tube that came with it because it did not seem very durable. I bought a tube from Napa and used that.
Here's where i have it connected on the vacuum line:
This is the gauge:
Today i was able to see how it was acting and i think it maybe reading a little low from the research that i've done
At idle it is at 17-18, which i think is normal. When i was accelerating slowly from a stop, it would usually be at 5. Once i was up to speed cruising around town at speeds between 30-45 MPH on level roads, it would be 15-18. On the highway going 55-60 MPH, on level ground it was at about 12-15, going up a hill it would drop to 5-10, and going down a hill it would be at 15-20. When i had my foot off the gas coasting to a stop, it would be at 20-23, usually with the needle shaking at whatever number it was at. If my car was in fuel cutoff mode, slowing down or coming to a stop (wideband read ---- and SG2 read 9999), it would be at a steady 23.
Never the whole trip, to and from my destination, did it ever go above 23
.
Are these reading usual or are they low? If they are low, what should i do?