Check the listing for details. NCV3 Sprinter (2007 - 2018) Dash switch adapter with switch. Condition: New without tags. Listed at 21.95 USD. Dash Switch adapters for installing rocker switches in 2007 - 2018 NCV3 Sprinter dash locations. 3D printed in tough nylon plastic. We have adapters with SPST and SPDT (center off) switches. Use of a relay to carry the load is recommended. See wiring diagram here: http://www.impact3d.com/relay_wiring.jpg For the lighted switches; The gold terminal is connected to ground(-). The outer silver terminal is +12V in (battery), The middle silver terminal is the load (light, relay, etc.) Colors may vary in shade and some have I (on) O (off) markings on them that aren't shown in the photos. Momentary switches are normally open and make contact when pressed in and held. A quantity of one equals one adapter and one switch. If you have questions about this product you can call Hein at 541-49O-5O98 Check out our other items!