Also, you can create a single map to be cylindrically mapped onto the fire extinguisher's tank...

Make a bitmap with a red background and all labeling... Use dimentions as appropriate for your tank... Height to width ratios should be about the same between the tank and the bitmap... The height is just that... Width would be the circumference of the tank

Create a material using that bitmap and appy it to the tank...

Add a UVW Map modifier and use a cylindrical map gizmo, adjusting the gizmo to taste...

On the one I suggested it's all on a single image that you're applying... depending on how close you get to your object...

I'd say at least 1024x1024, but for readability you should go higher (powers of 2)... 2048 maybe....