If you haven’t looked at your TF2 manual, take a peek at Ubermanuals.com (where you can also find wayward manuals for vacuum cleaners).

Always keep this in mind when Maintaining your Upgrade of the SG:

When Ultra-Sapper device is affixed to the top section
of the sentry device, remove red and green
wire and tune dial (bludgeon device with reckless
abandon using wrench included in package. Follow
up with sporadic shotgun fire in the immediate
vicinity of sentry device. Shotgun also included in
package.) to frequency KZQ-10z. [from page 6 of the SG manual]

1. New Gamemode: Gimp the Engy
2. Engy Dinner
3. TF2 Warpath: Engy Rush
4. Pad’s Faves: Cool Engy
5. Vanquished With the Power of Dance: Engy Update Revealed