Some time ago I was busy procrastinating about buying a laboratory power supply, due to the cost and my not wanting to pay it, when I came across the Powertech MP3800 at Jaycar. This power supply only cost $149, yet has better specs than many of the other power supplies available at twice the cost: 0-24V, 15A continuous. Not bad.
So I bought one, and it has been completely reliable. The only thing that I didn’t love was the absence of a digital volt meter. This isn’t exactly a problem, as the analogue gauge is accurate (if somewhat harder to read because they marked it strangely), and I normally just used my multimeter to check the voltage; however, I still wanted a digital gauge, and on my wanderings around eBay I saw some very cheap, LED voltmeters.
Long story short, see the pictures below of the voltmeter installed, and the brackets that I printed out to mount it off the rear power terminals.
I’m pretty happy with this, especially since the voltmeter cost less than $2.
The voltmeter was listed on eBay as a “0.36” LED Display Car Digital Voltage Voltmeter Gauge Panel 3 Wire DC 0-200V”, and comes in an assortment of LED colours (from soothing “everything’s okay” blue, to an angry “Danger Zone” red), and a selection of measurement voltage ranges.
Since the power supply can range from 0-30V, I just connected both the red (power supply) and blue (measured voltage) wires to the +ve terminal of the power supply, and the black (ground) wire to the ground terminal of the power supply.
For the 3D model of the backet that I used, check out the design on thingiverse (includes solidworks file so that you can modify it to suit your application):