Is there anyway I can make a control panel to upgrade a vehicle?

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I'm making a TDM and I want to make a control panel next to the team's vehicle spawn. If you have a certain number of kills, you can buy a new vehicle. Is this possible?

Jeep > Military Jeep (Has a turret) > Tank

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I'm moving this to help. Oops.

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No one is replying there so I'll unlock this in case. >_>