Hold enter button in, turn unit on and continue holding enter button in for 5 seconds. Release enter button and you will find yourself in the setup mode. (after the database and test page).

If you have a Gtx-330 push cursor button and use big right knob to highlight ”IN 1 speed low“ and use the small right knob to change  to high and turn big knob to highlight data and select GTX-330.

If you don’t have a GTX-330 do nothing with this page.

Page over to the screen below.

If you have a GTX-327 push in cursor button and highlight channel 1 input and select ”icarus-alt“ with small knob then use big knob to move over to channel 1 output and select ”aviation“.

If you have a fuel flow or other rs232 needs call for more information.

For a GTX-330 installation set no Channel 1 input and ”aviation ” output.

Page over to the screen below.

Turn ”OBS“ knob on your CDI to 150 degrees. Push right small knob and cursor over to ”calibrate to 150“. Push the enter button to calibrate. Push cursor button to stop highlighting.

Congratulations you did it.