I've had a vacuum gauge on my 72 GMC for over 25 years. Autometer one that says gas miser on it. It's a good gauge to watch and learn how to drive more efficient. Your watch the gauge as you drive(when safe) and see the amount of vacuum per load and throttle position. Good also to have a reference vacuum reading at idle. If something is out of whack the vacuum gauge shows a lower reading. Some people set their timing using vacuum. Not sure how accurate that is though.What is the best way to connect a vacuum gauge to check the engine performance on a stock 194 ci with a manual transmission
Many thanks for all of the responses to my vacuum hookup question, does anybody know the size of the threaded hole in the intake manifold before I go out and get a fitting to install in the manifold.my vacuum gauge hooked - up to my 'old stock 1bbl carb
.... click on the 'top bar' to enlarge the picture
#2 Look at the threaded hole in the 'stock intake manifold' -- that's where to hook - up your "vacuum gauge" fitting.
if you have a vacuum connection there already ---- just install a
" tee fitting "
#3 My vacuum gauge mounted inside