Glenn,
If what you have is our older Model 1 (tan in color), then no, you can not use the newer M7 SkyScreens because the Model 1s are preset to 24" SkyScreen separation without a way to change this preset. Our M7 SkyScreens are mounted to a completely different bracket from our older SkyScreens and are at 18" separation. The older and newer SkyScreens mount differently on the brackets as well so they are not interchangeable, unfortunately.
If you have our Model 1 XP chronograph, then yes, you can use these M7 IR SkyScreens on this chrono. The IR SkyScreens are much more reliable since they do not depend on ambient lighting to see the projectile, but the IR function does require a source of power to operate. When not supplied power, however, they will operate the same as our older Standard SkyScreens utilizing ambient lighting.
Yes, the cables are included, and are easily long enough to reach back to the shooting position when the screens are the recommended 10' away from the muzzle.