Basic Vampire stuff:

• Willpower becomes Blood. It only refreshed by drinking blood. Each point of Shock damage inflicted to a victim while drinking (against the Torso location) is a point of blood.

• Spend 1 point of blood to heal 2 shock or 1 killing. To add 1 die to any physical pool up to a limit which can be set to any value desired before rolling the rest.

• Vampire take shock damage rather than killing damage from guns.

• Vampires are more or less immune to lots of things (no special system for this really).

• Inflict Width in Killing damage with unarmed physical attacks

• Suffer Shock damage to every exposed location in sunlight (amount based on exposure). Vamps with special sensitivity suffer Killing damage instead.
  

Physical Disciplines would upgrade dice to Wiggle dice (set to any value after the rest are rolled), save for Fortitude (is that what it's called? The one that makes you tough). That one simply knocks off 1 killing and 1 shock from all damage you suffer.

Other disciplines do... other things. They might need some tweakage, but generally Width is speed/power and Height is quality against a fixed diff or against some resistance. There are other mechanical tweaks possible as well.

Sunlight rules:
A person that is burning takes Shock every round to every hit location (save head) which rolls over to killing when the location is filled up, and then rolls over into the torso or up from the torso into the head.

Say a vamp gets caught out in a bad way - VanHelsing yanks the curtains aside, and it's bright winter sun beaming in.

Say that kind of direct unavoidable exposure is 4 shock per round. Suddenly, he's got 4 shock damage to all his locations (save head). If he can't get under cover this round, he'll take the same next round, which means 8 Shock in his limbs, causing 3 to overlap and become Killing. In another round, his limbs are going to become nearly useless, and he's going to take a total of 12 shock to his torso (4 from the sun, and 8 from the bleed-over from his limbs). This on top of the 8 he already has there, and that's 10 killing from the overlap. He's dead unless he spends Blood (as the standin for Willpower) to stay alive for a round, heal some of this damage, or get the fuck out of the sunlight.

This is a worst-case though, but he'll be a crispy critter in three to five rounds, even if he's spending his max blood every round to heal the damage as it hits.

Say he throws a blanket over his head after the first round though- a heavy wool number. The GM rules this cuts his exposure to 2 Shock per round. Further, he dives for cover behind the sofa, getting out of direct exposure, and this cuts it to 1 per round. With a pool of 10 blood, he could heal 2 shock per point spent, letting him stay ahead of the damage (1 per location per round excluding the head, for a total of 5 per round) for 3 Blood. Longer, if he didn't mind picking up some exposure on some of his body.

How would the sun-resisting effects of a Discipline work? Roll the associated dice pool, and subtract the Width from the damage-per-location-per-round for one round. Doing anything else would require a multiple action.