Now that is a strange little story.
I've been over at rcu a long time , posting stuff and what not, but feel the forum is not a responding as some of the ones we have here, so it's become more so that I take a peak from time to time .
What I have seen is Erik posting some exciting news , but dates on releases and such is sometime in the blue. And suddenly you can go to rctank.de, and he will have the suff allready in stock. Like the leo lower, ore the new P4 ore what not . Still puzzels me who is making what , and how come it shows up faster here than in the states. Usually it is the other way around
Also seems airsoft is more pop in the US than here in Europe , am I right ? Now I hope you get that unit sorted .
he made a tk22 Clark installation video in 2015 it seems
and for the airsoft setup also
Since then he/they' have developed their own soundboard upgrade, sounding pritty much like a tk22 grade board, so that might be why he dont speak of
the Clark uppgrade atm, and as wolf say, it was just to show how it could be done . Could probably been an ibu unit if he had one at hand .
if you would still be interested in Clark uppgrade, I can help you out . The tk24 would be a nice board, same size as the tk22, but sound'engine' have been much improoved.
Here is a few clips of how the tiger/kt/jt sounds can be ( this is the bigger tk60 board, but the sound from a tk24 would be the same)
as with all other boards, it will require of you to get a new radio. My self I use a 4-6ch hobbyking radio costing some 25-30 $