Help me ID this please.

Our cars have two ignition circuits going from the ignition system; One from the start position and another from the crank position. For aftermarket ignition systems, these two have to somehow be joined together.
The cheap-O way is to run the blue wire and the brown wire together. But this leaves the start relay energized and sometimes the starter won't shut off.
The better way is to run the poweramp off the run circuit and relay the brown wire to send 12 volts to it whenever she's in crank mode.
This should be detailed in the MSD instruction manual.
Since the MSD only uses these signals to turn on the amp, there is very little current draw thru the relay, so it only has to be reliable. The amp has it's own battery power-supply.

OOPs I think I answered a non-existent question,lol.