The ESP transmits data up to 17 Isspro Performax Gauges. The way it works is through daisy changing gauges together and snapping them into their perspective pods, so they can be exchanged in minutes without the use of any special tools. Each Isspro Performax Gauge kit includes the necessary components required for installation. Once your initial setup has been installed changing gauges is as simple as unplugging the old one and plugging in the new gauge. Each gauge uses its own signal that lets you daisy chain them together with the same wiring harness avoiding a bundle of wires and the hassle of trying to figure out which wire goes to what gauge. Isspro Performax Gauges offer you the versatility that you want while still giving you a hassle-free installation.