Our indicator lights are available in multiple different sizes. We offer a 1/2" body, 3/4" body, a 1" body. The indicator lights are all 12V and have spade connectors to make it a very easy and seamless installation. For install, just drill a hole in your dash where you want the indicator lights to be positioned, plug in the spade connector and wah-la. They all contain a beveled end the prevent the indicator light being pushed through too far. All in all, these are really easy to install. You just need to figure out what size light would work best, and the color that you are wanting as well. Any questions, give us a call at 1-800-955-9795.