MIL-W-22759/32 wires are the predominant specification for motorsport harnesses...a bit thinner than 22759/16 specifications. In laying out your harness documention the number of wires in each branch of the harness can be easily determined. It gets a bit complicated with various splices for analog, digital and chassis gounds as well as 12V and 5V splices. Calculating wire bundle diameters this way saves a lot of guesswork.



 
                                                                                                                                                                                    
In choosing Raychem shrink products like DR-25, ATUM, and SCL tubing as well as Raychem molded products like boots, it is helpful to have an idea of the harness wire bundle diameters. It gets expensive ordering the wrong parts. 222K152-25-0 left above.  202K153-25-0 right above. ProwireUSA has the full line of Boots and dimensions and suggested Raychem Molded Boot for specific connectors.