As of a year ago CIH didn't offer a kit to add a field tracker to a head so you had to buy all the peices seperately. There isn't that much to them, just the pots, mounting brackets, some linkages and wiring harnesses.
As of a couple weeks ago you could by a kit to install the sensors on a 1020 but you had to order it through whole goods unless you buy everything through parts. The Kit was about 400$ but it make take a bit to get one. ' Dean