I have not got a pic from Bluegrass of the circuit board but I'll assume that this is a single compressor system.If duel compressor there is a Y2 terminal to deal with. In the south I have seen installers struggle with these heat pump systems and would like this discussed. Here is how I would do it: Use a 90-340 relay. Let the second stat power the relay and power terminal #3and #6. terminal #4 put a green wire jumper to G on board. original green wire goes to #5 which creates a normal closed circuit. When it trips will power the G. #1 terminal gets a jumper to the Y on board. Original stat yellow and yellow from compressor go to #2 terminal.This is also the normally closed circuit. When the second T- stat it powers G and Y fan goes to 100%. Should the original want to back up the wood stat it can at any time as the yellow from the original stat is still connected to the compressor yellow. The fan is already on high. This hookup only takes a 90-340 relay.
We have done a bunch of these and they seem to work good, but there may be something better.
If you are using the Y2 or YO on the board a Different setup is needed.