Military specification M22759/32 is the motorsport industry standard wire. High chemical resistence, tough, flexible, small dimensions, can cope with up to 150 degree heat, it is used in satellites, aircraft, offshore platforms, military applications, any where high performance is demanded. Commonly known as  Tefzel.
 
If you are building a motorsport quailty harness this the wire to use. Light, flexible, lays up nicely due the ETFE polymer coating, this cable saves time. 
 
Maximum single length 5m, sold by the metre