The PrimaLuce Lab Eagle computer requires at least 12.8 Volts although it is supplied with a cigarette style power plug and I have used it like this for sometime with the RASA twins, I would advise to get a regulator. A regulator will provide a consistent power supply to the Eagle Computer. I would also look at a regulator that you can adjust the power output. The longer your power cord is from the power supply to the Eagle computer, you will drop volts. Having an adjustable regulator you can make sure you are supplying 12.8 volts to your Eagle computer. I use a Victron Energy DC to DC converter
Model: Orion- Tr 12 | 12 - 9 It's been a great unit and I'm very happy with it.