This 125K Mileage Maintenance Kit for 7.3L IDI Ford International 1983-1989 is a great option for engines that start to need more than just routine maintenance to get up and running. This kit includes 8 new & never installed IDI injectors, return line kit for injector installation, 8 glow plugs, and the original manual style glow plug relay controller solenoid kit with the push to hold button switch. All Diesel Care and Performance products carry a one year warranty.