I was idling around and played with the silent choice it dropped both gauges down at least 2 volts

I am supprised that the Corsa did not insist on a rather LARGE gage wire or the use of a relay. It's too bad PQ did not recognize this as a problem.
Oh well just something else to improve

When I sell this boat someone will have a nice trouble free ride do to all the tweaking done ever since I bought it.