Switching from the LC1 to the LC2 left me with an unused LED in my wideband gauge pod. The LC1 used the LED for status but this feature has been moved directly to the LC2 controller. To provide a visual cue of pump activity, I decided to connect the LED to the DevilsOwn controller so it lights up when the injection system is triggered.
The wire connect to the LED needed 12v and the LED ground was connected at the gauge pod. The DevilsOwn controller pulses the ground line, which meant I either had to remove and rewire the LED, which is kind of a pain with a bunch of junk crammed into the gauge pod) or I could build a simple circuit to send 12v in the presence of the switched ground.
Contained in heat shrink tube mess is a simple 3906 transistor circuit which inverts the pulsed ground and outputs pulsed 12v. I then piggybacked it onto the SSI4 connection and hooked the output to the LED wire.