Contact a vendor for EFI Live like Idaho Rob at ATPTrucks.com or someone who sells DSP5 switches, usually they'll sell you a terminal pin crimped to the wire already.
I bought mine from the dealer, but it was a PITA for them to find.
Wrote this for DF and figured I'd copy it over here too.
I have seen a lot of threads lately about people having broken or stuck ECM pins. Usually this is during a DSP5 installation or High Idle. There is also a lot of half accurate information suggesting how to fix this issue. I've...
Check all your grounds. You get the ground between the firewall and engine / frame reconnected? You might try adding a ground between frame and engine to see if it resolves any issues. Check battery terminals to make sure they're good on both sides. Check the main power wire to make sure...