I need a voltmeter and hopefully a multimeter for a project. It needs to be mountable into a flat panel. I've seen a number of voltmeters but only one that claims to be a multimeter (bottom link). Does anyone know of any or have used any?

https://www.adafruit.com/products/575

http://www.ebay.com/itm/VAM9020-Dua...ltage-Current-20A-90V-Voltmeter-/300931293853

 

Please define the functions you need in the "multimeter"..
Also do you need AC or DC and what ranges?
There are numerous volt/amp gauges if thats what you mean..
http://www.amazon.com/Volt-Meter-Digital-Shunt-200V/dp/B005HBBZEM
http://www.mpja.com/Digital-Panel-Meters/products/52/
http://www.ebay.com/itm/like/131153244228?ul_noapp=true&chn=ps&lpid=82

 

I would like to be able to measure AC & DC as well as resistance. AS far as voltage range, I would say a minimum is 500v.

I would be able to use a standard multimeter (handheld) if I could change the LED output from the one built into the unit to a lighted one (IDK if there is a conversion cable to change the display type). I can mount the board so that it is functional.

 

Why not just buy a proper multimeter with a backlight if thats all you need?

and I assume you mean "maximum 500V" not minimum.

There is a "BIG" difference in a purpose built volt/amp display like the one you linked to and a real fluke type multimeter.
This is a multimeter
http://www.amazon.com/Fluke-ESFP-True-Multimeter-Backlight/dp/B00012Z0V6
This is NOT
http://www.amazon.com/Volt-Meter-Digital-Shunt-200V/dp/B005HBBZEM

A real multimeter just uses a generic character display and the circuitry inside the meter sends the proper digits to it.
A "voltmeter" has the circuitry already built into it to ONLY display voltage or current in a range specified by the circuitry inside the meter