volt amp meter needed

The only round volt/amp combined meter I've seen is the one available from Powerwerx. They are a respected supplier of good quality stuff to the ham radio world.

https://powerwerx.com/panel-mount-dc-amp-volt-meter

Datel makes some high quality panel meters and are made in the US here.. They have a round LED voltmeter but no combination V & A meter and no round ammeter. The model below is "oiltight" and sealed. Has screw terminals on the back but you probably dab some epoxy on them? Datel meters are high quality but not cheap.

Datel does have small square panel meters tho. The problem with a DC ammeter on 12 VDC is that you likely need a shunt and that will have to be mounted somewhere and they're not small. Some meters also require a 5 VDC power supply to work. It could be hard finding something that is watertight and rated for a moisture location. For example, the Datel meter below is rated IP67.

But yes, what are you doing in a kayak?

Here is a link to several types of panel metersMPJA Electronics They have square and round, DC and AC, multi function and current types.

Sounds to me like what you need is a battery voltage monitor that is made for a marine application. I would think that any large boat dealer would have one.....and maybe smaller dealers too.

I STRONGLY encourage you to NOT make any hole to mount it; just glue it in place.

Why are you mounting a meter on your kayak?