Last edit by: IB Advertising
See related guides and technical advice from our community experts:
Browse all: General Overview
- Jeep Grand Cherokee WJ 1999 to 2004 Crash Test and Safety Ratings
Important Information to help you understand your Jeep Grand Cherokee.
Browse all: General Overview
XJ Ask the Question Thread
CF Veteran
Joined: Sep 2011
Posts: 10,447
Likes: 0
From: Frederick, MD
Year: 1989
Model: Cherokee
Engine: 4.0
Originally Posted by dukie564
It's a vacuum gauge. The higher the manifold vacuum pressure, the better fuel economy you get. At zero pressure, it pretty much means your throttle is open 100% or near that.
The gauge works pretty much as a feedback system to the driver. It would tell the driver if what he is doing will give good or bad fuel mileage.
CF Veteran
Joined: Sep 2011
Posts: 10,447
Likes: 0
From: Frederick, MD
Year: 1989
Model: Cherokee
Engine: 4.0
Trying to find bulbs to go into my gauge cluster. Using superbrightleds.com. put in my vehicle specs and it tells me to use "74s" aren't the bulbs 194? I'm just confused.
CF Veteran
Joined: Sep 2011
Posts: 10,447
Likes: 0
From: Frederick, MD
Year: 1989
Model: Cherokee
Engine: 4.0
Originally Posted by lowrange2
I believe they're smaller than a 194.
CF Veteran
Joined: Apr 2011
Posts: 4,825
Likes: 2
From: Indianapolis
Year: '99 and '91
Model: Cherokee




