In addition to the tap signal interface, we're also working on a cruise signal interface. Newer ECMs and BCMs require a varying voltage (through one wire) to indicate the driver's cruise signal commands. Early (and aftermarket) cruise control switches pulse 12V to indicate On/Off, Set/Coast, Accel/Resume. This interface will be much like the tap signal interface with custom CNC enclosure using a Delphi header/connector solution.
5/3/2011 EDIT...here is the completed module. EFI# 110-00024.