The fields is a very standard and easy to use fuel/vtec controller. If I remember correctly, you can adjust fuel settings in +/- 1% increments up to 30%. Unlike a APEX unit you can only adjust fuel settings in 1000rpm increments. Vtec can be set at a desired rpm in 100rpm increments. There's also a speedometer reading, speed governor bypass, and shift indicator function. Also when you switch to high cam the face turns red from green.

As far as the install goes, it's pretty straighforward if you have the harness that came with it. Just tap 2 lines and splice the others into the computer harness. I'm sure you can find a diagram online somewhere if you can't figure it out. Make sure you have the dipswitches on the back set right.

It's been awhile since I've used this unit but I think that's pretty much it.