What techniques, tools, or instruments are used while performing zero-g parabolic dives?
I'm an aerobatic pilot, with exactly 0 hours of turbine time, so this is a guess:


Climb to altitude and establish a predetermined airspeed.
Gently push to an 'A' degree nose down attitude, and maintain throttles at 'B'(accelerate to the highest airspeed permitted)
When airspeed indicator shows 'C', gently pull up to a nose-up attitude of 'D' (use the G meter to ensure you do not exceed 'E' Gs)
When airspeed indicator indicates 'F', reference the G meter and slowly push over to 0 Gs.  
Monitor the changing pitch attitude and airspeed.  Warn the passengers when certain limits are passed.  (i.e., 10 seconds to recovery)
When nose-down pitch of 'G' is achieved, stop pushing and begin pulling back to level flight, taking extreme care not to exceed Vne (or other appropriate limit) and the G limit of the airplane.


Instruments required: Altimeter, Airspeed Indicator, G-meter, Attitude Indicator