I've been looking for a voltmeter, and ran across a BMW owner who built his own that I liked a lot..... so I figured I would replicate his work. I rarely ride in the dark so I don't need an LED unit. I was interested in LCD, and the Datel works great for my needs. And I didn't want to cut up my dash so it had to be a surface mount unit.
I bought a BUD Potting Box (part number: 563-PB-1558)....
.... a BUD potting box cover (part number: PBC-1558-CN)....
..... and a Datel LCD digital panel meter (part number: 20LCD-1-DCM-C).
All were from from Mouser Electronics and arrived extremely quickly - www.mouser.com
I carefully measured and using a razor, cut an opening for the unit in the potting box.
The Datel unit slipped right in.
I used 5 minute epoxy around the edges of the Datel unit to hold it in place as well as waterproof it. I took a charger from an old Nokia phone, cracked open the transformer to get at the wires, cut off the other end, and wired that to the terminals on the Datel unit. I used my multimeter to compare voltages at the battery and used the adjusting screw on the Datel unit to calibrate it. Cut a slot to fit the cord through, epoxied it in place, and then epoxied the potting box cover on the back of the potting box. I am fairly confident that water cannot get into the box.
I mounted the box to my dash with 3M Dual Lock velcro.
Here is the meter with the engine warmed up and idling:
Here is the meter at 3000 RPM:
I have found my voltage readings to be very consistent at any RPM over idle (pretty much 14.7 volts at any RPM above idle). I purchased a VFRness but have not installed it yet. Maybe I won't need to but now I feel better about being able to keep my eye on my electrical system.
Credit for this project goes to: Surface Mount Datel LCD Voltmeter Install Thank you!