Kit from CIH to make it work electrically. You'll also want a serrated feeder chain. Need to slide auger as far back as possible, you'll also want rubber flaps that bolt onto auger to kick crop back into feeder, there nothing more than 3" tall by 6-8" long.
Don't want to offend anyone but CNH heads are junk. I assume you have a 1020 now, stick with it.
Headsight has a much easier to install kit to make these two work together. Please contact us before you buy the CIH stuff...that CIH kit is a pain to install and is a nighmare to troubleshoot if it does not work.