Wild Card: Finishing Touches

 is a quest in Fallout: New Vegas.

Quick walkthrough
The Courier is tasked to visit the El Dorado Substation and plant a chip to extend the Yes Man's broadcasting range.

Detailed walkthrough

 * OPTIONAL1: You will be given this quest once you finished the Wild Card:Side Bets quest from Yes Man. It requires you to upload an Override Chip into the El Dorado Substation controlled by the NCR. An optional objective to the quest is for you to save President Kimball when he arrives to give his speech. If you go to save the president you will talk to Ranger Grant and he will ask you to help if you are friendly with the NCR. He will ask you to conduct a search but this is not needed. Go outside and wait for Ranger Grant and talk to him. Immediately after doing this the president's Vertibird will arrive with him inside. The tower closest to the Hoover Dam Visitor Center you were just in is where the assassin will be. Go up top by asking the guard to see the vertibird and using 50 speech to convince him to say yes, once you're up there you can examine the vertibird with 50 repair or 50 explosive. You discover a bomb on the vertibird. Go down and speak to Ranger Grant and tell him about the bomb and he will prematurely end the speech and have the president take off in the vertibird. Saving the president will result in the NCR Idolizing you.


 * OPTIONAL2: Facing the stage where President Kimball gives his speech, there is a tower.  When President Kimball first gives his speech, you'll notice two figures on top of the tower.  One of the figures walks over to the other and you can see a figure fall off the tower. Sneak over to the tower and climb the ladder.  At the top of the tower, the "NCR Ranger" will initiate dialogue.  Your dialogue choices will be to either radio it in or go down and check it out.  You must select radio it in twice.  The "NCR Ranger" will say that you're not worth the trouble and then attack you.  After you defeat the assasin, you can go tell Ranger Grant and he will cancel the speech early.  As NCR Rangers move to inform President Kimball, an Engineer wil attempt to kill him with a knife.  If you kill the Engineer after he attacks the President (makes it to the stage), you receive 105 XP. If before he makes the attempt you receive only 30 XP (must have pulled the knife and started towards the stage).  If you do nothing, President Kimball's security detail kill the Engineer and President Kimbal runs to the vertibird and leaves.


 * OPTIONAL3: There are two engineers standing in front of the president. One of them has a knife(see OPTIONAL2), the other has a detonator. You can pickpocket it and report back to Ranger Grant. This will also stop the president's speech and the quest will be completed.


 * Note** If you've disarmed the Bomb and killed the sniper you can tell Ranger Grant nothing and finish the quest.  Telling Ranger Grant about either attempt causes him to end the speech early, but telling about the sniper causes the Engineer to attack President Kimbal with a knife.


 * The main part of this mission is very simple. Go to the El Dorado Substation and upload the Override Chip into the terminal located inside. There will also be a few NCR troops inside though that will shoot on sight so try to sneak in with a Stealth Boy if possible. The best way is to wear NCR armor, the guards don't attack you that way. If you did the optional part of this quest and kill the troops in the substation it will not matter to your Reputation because you are so liked.


 * OPTIONAL: Yes Man asks you to convince the Followers of the Apocalypse to give full assistance to the New Vegas region; simply go and talk to Julie Farkas. There appears to be no way that she'll decline, so once you're done just report back to the Lucky 38 and complete your quest (and enjoy your Wild Card achievement).


 * NOTE: Unless you are wearing NCR faction armor and so act in disguise, Boone will leave your party if he is with you when install the override chip at the substation. (Without the benefit of a faction disguise, a work-around is to tell Boone to wait outside of the substation so that he does not witness the chip installation, then he will remain with your party.)