There is 3 leds, The center Led is the one doing all the flashing. Playing with a volt meter. I get 11.8 volts to the Megasquirt. I have clean bare metal grounds, Seeing 4.8 volts to the TPS,VSS,Crank sensor.
The only thing not hookup is the Fan control and f idle. The only wire i don't see power with Key on is the coil.

Tried 2 laptops, I even drag the home computer to the garage..lol The cables are good, One cable i tried is a friends cable he uses for his Megasquirt Honda.