This is a 100' spool of 10 GA heat resistant wire. You can use this wire for high temp applications like glow plug harness repair. The 7.3L motor uses a 6v glow plug and the harness heats up quite a bit.
This wire is rated at 257 degrees farenheit.
Made in America.
DISCONNECT BATTERY before doing any work. PLEASE READ BEFORE YOU ORDER: At least 40 years have passed since your machine was built. Many people have worked on, and changed things from factory configuration. It is customer's responsibility to make sure that harness and contact arrangement is correct for the application. Because the previous old harnesses may have damaged components in your electrical system, Pacific Supply Group accepts no liability for any device that you attach this new harness to.
Made in America. 
Glow Plug Wiring Harness For 7.3L IDI International Trucks
CH84 Glow Plug For 7.3L IDI Motor
International 4000 Series Ignition Switch With Keys
Switch Cover - Water Proof - Toggle