DC ground for 2 Power supplies

[Trevorcmoore]

Hi guys could someone advise me of the simplest way to connect/chain DC ground to 2 power supplies?

I have a Sega 400-5198 and a JVS power supply from Axum works.

I use both to power the Astro city, CPS2 and Naomi netdimm which have a jamma switcher.

Thank you

 

[Trevorcmoore]

Could I just wire up a ground here and solder it to the jamma harness?