Vacuum Gauge to Tune Carb
I've got a '89 ProStar 190 with a Holley 4160 carb. I know the carb can be tuned without a vacuum gauge but using one intrigues me. I've watched the video on the Holley website on using the gauge. They talk about hooking up the gauge to a full manifold vacuum port. The only vacuum port that I see on my engine is the one going to the PCV value. Is this the one I use? Is there another port that I am not seeing? Any insight is greatly appreciated.