Dash Power wire?????

Are you sure that aftermarket guage is an Ampmeter and not a voltmeter? Most people would replace the original dash Ampmeter with a voltmeter. O.K. doesn't really matter. :) Originally, the main power wire came through the firewall block and went to the left side of the original ammeter in the dash cluster. It then ran from the right side of the ampmeter to the starter relay, as the other guys already mentioned. If you think about this for a minute, you'll see you have a complete circuit: Battery(main power); through the dash to the ampmeter; to the starter relay. Now you have the possibility that the car will start. If you break the continuity anywhere along that path, you then have a no start situation.
So, now back up a little to where you took the wire that came from the battery to the aftermarket guage, and you said: "after I took this out (a wire was mented or close to) now I have nothng at all.." Right there is the break in continuity I was talking about. You have no power between the battery and the starter relay, and that definitely won't help your car start. You need to get that circuit back to a full electrical path again. Hope this helps. :)