I want to put in aftermarket oil pressure and water temp gauges in my S4, and I want to have the gauges sit in a pod where the ashtray usually sits. From all the threads I've looked through I've seen some people say through the wiring harness grommet, the speedo cable grommet and the throttle cable grommet. For where I plan to have the gauges, which is the best in your guys opinion? Also pictures of where and how you ran them are much appreciated. Thanks guys.