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Well it looks like I found a working 5 volt supply that works!   It's a Lambda LXS-A-5-0V (a brick, and this is stock photo off the web)..  So I wanted to test the the power supply. So I grabbed  the Fuel Load Indicator, that I tore apart in my blog post NexGen: Hacking the Fuel Load Indicator. I hooked my +5 to pin 16 of the display and Ground on pin 17 and I got the following: Manufacturer: LAMBDA Model Number: LXS-A-5-0V Output Voltage: 0 - 5 vdc Output Current: 4 amps ...