Discussion and questions related to the course Professional Motorsport Wiring Harness Construction
Size of head shrink (sheathing) for the small wires I only know 3/4 and 1/2 inch
If you are talking about DR25 which is commonly used for sheathing, then that is available down to 1/8 diameter (shrinks to 1/16"). If you are talking about standard polyolefin heat shrink then that stuff is available down to tiny sizes - probably 0.5mm (0.020") or less.
Thanks for the help and I was talking about the sensor wires sheathing such as wideband oxygen sensor or pressure sensors, basically 3 to 6 wires the most for a sensor or in other case DBW throttle body