I've got a DIYPNP running with an MTX-L wideband, and am trying to make sure my connections are good. When setup on VE analyze live it maintains pretty close to my targets, but still jumps around a bit. It is a little off from Tunerstudio readout, but seems to be normal when driving. Anyway, This screenshot shows my AFR reading jumping around, is it normal for is to be cyclic? Or is it supposed to be closer to a flat line?
I have the ground and signal wires running parallel under the console back to the PNP going through the DB9 connection, so maybe I'm picking up signal noise. Should I ground it closer to the gauge itself?

 

That's a crazy looking fuel map you've got there.

What is the horizontal range of that graph?