Have power from battery, but won't even turn over. Not even clicking sound.

What is your question?

The gauges go nuts. Tells me low fuel, I don't know the speed, cause it's going hey wire. The tlc light comes on. Tires are fine. Very baffled.

What makes this problem better or worse?

Start up

How long has your 2007 Pontiac G5 had this problem?

Month or so but it doesn't do it everyday