Tyre-pressure Filling
Fix your old tyre pressure gauge, enable power and start refilling air in different cars. People on longer journeys often don't find tyre shops. You can make a lot of business out of it.

Tyre Replacement
Identify the tyre is short of air or requires replacement. Take the vehicle in tyre-replacement shop, use hydraulic jack to lift uplift the car, use bolt gun and remove the damaged tyre. Pick a new tyre from the inventory and install it.. Make sure, to check rim size before you replace the tyre.