Plugging in this inexpensive feature to your Powercommander will all the user to choose to do one of the following:

• Load two different maps into your Powercommander and switch between them on the fly. At Rottweiler we make many 'in-house' maps for our power parts configurations and off both 'Economy' and 'Power' maps for some setups. This allows the user to use 'Economy' while getting there, and 'Power' once the fun begins. The fuel savings will end up paying for the switch in no time.
• The switch can also be repurposed with the Addition of an 'Auto tune' to turn it on and off. This gives the user a sort of 'hybrid' way of performing the above line but with the addition that one of the two maps is 'live' and always optimized utilizing the Auto Tune's features. Build an economy map with Auto Tune at 13.8 to 14.0 AFR, transfer that map to the PC, reset the Auto Tune for 13.2 when it's on and you're done. Switch up, Auto Tune is optimizing power mode. Switch off and you are running solely from the PC which has an economy map.
• (Less common) Once speed has been set up in the PC using a speedo cable input, the switch can be repurposed to limit speed via rev limiter cutout. This is most common in pit lanes with speed limits while racing.