Wiring is now a critcal part of a modern competition car, - it is no longer the last thing that gets paid attention.
Reliable wiring and connectors are now critical.
Motorsport has followed aerospace in wiring specifications and best practice, modifing the requirements in the last 20 years or so. So while there is plenty of "mil- spec " wire out there make sure you look out for :
Kiwi Connectors stocks mil spec tefzel M22759/32 and Raychem type 44 and 55. Rated to -65 -150 degrees.
Prices vary between sizes and colours. Special prices on 100m reels
Conductor size is expresed in AWG (american wire gauge )
More information on wire specifications sold on this site can be found here.