My pic is a Z-326 ;no RPM control,it`s mixture,fixed pitch wooden prop,;your pic is rear cockpit of -326....
Z526 has metal automatic CSU prop,and solo flown from rear cockpit for CoG reasons...all switchery in back cockpit..
Go ,tighten yr neg.G strap right up,and have a workout...!
and the mags were left ON in the rear....!!!!