I've actually been re-writing the chuonthis s14digital climate control tutorial to post on my blog. But if you're interested, a pricey option imo is you can buy the plugs new and new pins if you want to either adapt the oem wiring or run your own.
CET2031 for the 20 pin plug
https://connectorexperts.com/i-31643...tegory:1458532
CET1682 for the 16 pin plug
https://connectorexperts.com/i-31644...tegory:1458528
I'm not sure what the pinout count for the s13 is but that connector style is the same as the usdm one, the terminal ends are
TERM432 -
https://connectorexperts.com/i-31644138-term432.html