im on the quest the kings gambit where im supposed to talk to the king about NCR support if he ceases his hostility. so he agreed but it didnt finish the quest. also it wants me to kill pacer but i cant find him and the quest locator only takes me to the king how do it finish this one.

http://fallout.wikia.com/wiki/King%27s_Gambit

1. Follow Walkthrough for quest, load back if you need to.
2. Finish Quest
3. Give yourself a high-five.