The best of both worlds is now in your hand. Utilize your Pressure base system for real time pressure readings on all four corners plus the tank for daily, spirited or track driving. Or ADD the level sensors allowing you to add passengers and or cargo to your vehicle, switch over to Height base sensors, and level out the car to your desired setting! See Extended Descriptions for a comparison chart of the 3P Pressure systems abilities along side the 3H Height abilities. Here is what you Get!APP FOR IOS OR ANDROID. 4 Gallon 5 Port Aluminum Tank. PERFORMANCE Front Strut Kit 78503. PERFORMANCE Rear Strut & Bag Kit 78603.