linz this is the biggest pain in the asre i have ever had just behind the battery there is a grommet u can use i found it by chance after an hour of ponderin wether to get the drill out lol
if not u can go thru the wirin housin under the wiper motor but if u goin to do it that way if u want a boost gauge do it at the same time as u have to take the wpiers off and the plastic trim under neath also wiper motor has to cme out what a mission lol good luck hope that helps
