Hey I have a 88 jeep xj and I was wondering EXACTLY what line I would need to use for installing a vacuum gauge on my 88 jeep xj

 

Just use the most convenient for you to hook into. Vacuum is created just below the Throttle Body Butterfly Valve. The rate of vacuum in the intake Manifold is fairly even no matter what port you use.

No matter where you put it there will be common slight fluctuations throughout the system when accessories are using it. All fluctuations should be the same and equal on all manifold ports.

Back in the day we used to use Vacuum Gauges to tune Engines and keep an eye on fuel usage. We used the AM Radio to check for leaky plug wires

 

Just behind the throttle body is a line into the intake manifold. Put a T into there and route the hose into the cabin to your gauge.

 

Thanks for the replys very helpful !

 

Check this out!!

http://www.ehow.com/how-does_4672496...y-driving.html

 

Yep, This link would be a good addition to my Cruise Control issue post. It is "Jack Rabbiting" when it applies throttle to maintain a set speed.

Using a Vacuum gauge is how I learned to get good fuel mileage with driving habits. Just keep it as high as possible in all conditions.