I used these to upgrade an old PSU with non working dial indicators. They look great and as far as I can tell they are pretty accurate. The only thing I was hoping for was to be able to control the brightness so I could adjust the volt and ammeter. They're very close, but I wanted to tweak a little. I disassembled the module hoping to find access to the LCD pins so I could put a resistor on the common side of the LCD segments, but the pins go straight to the board so I didn't go any further. But I have a closeup photo of the back of the board (LCD on the other side) so I've included it in case anyone is interested.