Where Is All The Tech Help

I Wired Everything Up As Steve68 Gave Me .it All Hooked Up Perfect And When I Fired Up The Car And Nothing Moved. The Dash Was Grounded And There Was 12v To The Fuel Gauge But Nothinng Worked. Could We Have Fried Something? I Want To Keep The Rally Dash But Want To Drive My Car More So Custom Comes To Mind.
Thanks Guys, Steve