Last week we got our first two cockpit instruments to work and roughly calibrated in the ANT-18. After restoring the two regulator bellows and replacing a good bit of bad vacuum hose, our cockpit engine RPM and air speed instruments started to work. Yea! Both instruments respond to throttle, and the air speed decreases in a climb. When we connect up the instructor’s air speed instrument, the cockpit air speed instrument unfortunately stops working – so we’ve got some troubleshooting to do.