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Message: <blockquote data-quote="crx4luke" data-source="post: 3297878" data-attributes="member: 559304"><p>Usually the buttons are grayed out when the parking brake wire (red/white wire) isn't receiving a ground signal, whether it is simply grounded or hooked up to the parking brake wire. Oh, and when the vss is hooked up it makes it so much more accurate on the screen. I'd get it hooked up, but it doesn't have to be connected.</p></blockquote><p></p>

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