Celica Forums General Discussion Exterior Ground Wire for after market head unit...HELP!

I'm trying to ground my aftermarket head unit but can't find a single place to do it...a friend says I can ground it to some bolt that holds the radio, but I dunno, I thought it had to be connected to the chasis of the car... I was wondering if its safe to splice into the stock harness black wire... and if that'll be ok? Help me please~

there is a bolt at the bottom of the dashboard and right above the gas pedal. i grounded my gauges to that bolt and it seems to work fine

Thanks, I found a place to ground it =) but then I found out my mounting kit was the wrong one...aah i need to go buy another one tomm