twin motors= separate dash voltage gauges

When 1 motors key is turned on, the voltmeter needle on that motor raises to 12v in a slow steady movement, like I would expect.

however, the other motors voltmeter needle goes flying to 12v instantly and kinda bounces at 12v until it settles down. keep in mind this is a 1-2 second time frame, but still got to be something not quite right.

Any thoughts?
Thanks

Check your grounds.

So if I just ran a jumper ground wire directly from the battery to the ground post on the gauge, that should settle it down if that is the problem?

yep.
In fact, if you have a spare PWC or cycle battery, disconnect one lead from the gauge (whichever is easiest to disconnect) and hook the little battery to it. Observe the movement of the needle. If it is still weird, then it is a bad gauge. If it moves correctly, then you have an issue in the boat's wiring.

Nothing in the wiring can cause that. Volt meter has lost it's damping.

Good News!
Checked with a jumper box directly to the gauge. same thing. Gauge is the culprit. At least don't have to track down a wiring issue.

Is the damping done by electronics or is it mechanical?

its meachanical and it does wear out over time

Does anyone know if this is a repairable item? The gauge is a Gaffig, don't want to replace it with the new 'Livorsi' face plate gauge.
Thanks

Have you called Livorsi to see if they will repair it and leave the face as is?