Pulsar use here own wiring standard,pin 1 is +,so you can ignore that one,pin 2 ground,then 3 to 8 for channels 1-6.No idea how the dmux is configured but the ground from your d-mux goes to all the pin 2's on the 8 pin din,channel 1 on the d mux to pin 3 on the first 8 pin din ,channel 2 to pin 4,3 to 5,4 to 6 ,6 to 7 and channel 6 to pin 8.Channel 7 from the d mux goes to pin 3 on the second din plug,channel 13 to pin 3 on the third 8 pin,and channel 19 to pin 3 on the forth din,I'll leave you to work the rest out