The Deathhead Knob
Possibilities: 3 
Tapping Difficulty: 16
Purpose:
To keep moving.
Description:
The Deathhead Knob appears as a chrome skull just smaller than a fist, with sharp fangs and a wide grin. Inside its deep eye sockets are two eerily glowing gems, one red, the other blue. Whatever its original, sinister purpose, now it’s usually affixed to automobile gear shifts. Vehicles left in one place too long after the knob is installed tend to mysteriously disappear.
Powers:
When installed in a vehicle of any type that vehicle’s Maneuverability Rating (page 167) increases by two. Note that may make the rating a positive number. The driver may test to tap the shard to attempt to Soak damage to the vehicle.
Restrictions:
The knob’s may only be used to enhance vehicle skill tests and to Soak 
to the vehicle as described above in Powers.
From Core Rules