I finally tracked down and bought most of the parts I need to add the Brittain Accutrack 2 and Accuflite to my 1968 M-20-F Mooney. I sent them to the Brittain folks and they are ready for install but I need to find a servo control valve and a directional gyro. They say the directional gyro I need must be a Edo-aire or equivalent 4000-D, 502A unit. If you have one of these or know of someone who does I can sure use the help.I am located in Las Vegas.