They're all pretty easy to fit. All come with instructions. I know a few people that have bought them off eBay. I've got pz racing on mine, came with the bike.
I have PZ Racing on my 2011, although didn't fit it myself. I believe they're a simple plug and play. This might help:
I fitted a Healtech DS unit recently to my 07 Blade and it works brilliant. Highly recommended by me.
They all connect under the seat, i think the diagnostic port so very easy to fit., tank cover off and lift tank to route cable, job done. took me no more than 20 minutes Pete
https://www.bikehps.com/acatalog/GIpro_Digital_Gear_Indicators_for_Honda_motorcycles.html I had one of these on my 2005 blade and it worked perfectly
This one. Very easy to fix. You need to put your bike on paddock stands and plug in the GI pro & follow instructions.