TH350 to SM465 wiring question

[Jholden]

Doing a ground up restoration on 76 K10. In the process have switched from a TH350 to a SM465. Question is how to get the back up switch on the 465 wired to the pigtail on the under dash harness for the automatic? I have the wiring back in the truck and 2 pigtails left to connect near the column. One is 2 purple wires and the other is blue and green. Which goes where and is there a short harness available to get from the switch on the 465 to the under dash harness? Thanks in advance!
Jason

 

[bucket]

My guess is the two purple wires are for the clutch pedal switch, if they are a heavier gauge.

 

[Jholden]

That's what i was hoping. now i just have to find the pigtail for the brake light switch