Summary

Simple Voltmeter / Ammeter housing. Bottom lip was designed for a slip-in fit on a ride-on vehicle to monitor battery voltage. Holes can be added as needed for your application.

box opening was deigned for 45mm wide, 29mm tall meters. wires exit through the small hole in the back of the part.

Designed in TinkerCAD, and printed with toybox small format printer. No supports needed, however possible you may need some cleanup of any stinging over bridge of the opening.