Hi Glenn,
The wiring for RS 21-1172D is as follows:
Yellow wire - pin 1 of 8 pin plug
Red wire - pin 2 " " " "
Black wire - pin 8 " " " "
Copper shld - pin 8 " " " "
P1 jumper block wiring on K2 - Straight thru for all 1 thru 8
For best results need to change R14 form 1K to 10K on SSB board for
better
output. Good luck.
73,
Rod WA9GQT K2 #1900