Bought a 2007 H3 have a few questions
 

Hi I bought a 07 H3 and its awesome. They only thing I would like to do is to install an in-dash gps system . I need to know which ones would be the best dimension to match the hole that would be left if I take the stock radio out . I was just wondering if anybody has done that and how it worked out for them. Also (another subject) when I turn my key to "on" before I turn it to "start" do I have to wait for all of the warning lights to turn off? Even if I wait they turn back on anyway when I start and then turn off. Just my friend said it was good to keep it on "on" for a few seconds to wait for all of the gauges to rise. And how long should I wait before actually driving, because I see some people turn on their cars and take off the next second. Some people tell me to wait for the oil to warm up some people say its not good to idle the car for too long.