I used Van's "throttle / mixture" quadrant hooked up with 4130 pushrods tapped to receive threaded rod to fit the clevises. Using 4130 kept the diameter down for clearance through the bulkheads. I've seen them with 3 levers, but the third pushrod had to go inboard of the bulkheads with a cover. Hardest part was hooking em up once the fuselage was fully assembled...
Okanagan Valley BC, Canada
RV-8 Completed Dec 2013
Membership renewed Nov 30, 2017