All,  I've just finished up a complete new panel on my 86 Rocket and have three leftover items for sale. GDC-31--working perfectly and is magical. Turns GPS Steering from a WAAS navigator into "heading inputs" to a legacy autopilot (mine was a KFC200).  Allows the airplane to fly a complete approach from the IAF to final in "HDG" mode on the autopilot, just switch to "Nav" and hand-set the new/final course on the HSI when intercept is set up.  Magical.  Great way to upgrade your approa