I'm working on a circuit to manipulate an existing signal for an automotive hydraulic hybrid product. I need to pass on a 0.46 to 0.55V signal to the ECU during accelereration to keep the engine from revving and restore the original signal (0.55 to 5.5V) when the engine takes over. This would be easy but I only have one position on my connector left. Basically I need to make the ECU think that the truck is idling while accellerating and then take over and function normally. Maybe I'm being a bonehead, but it seems this should be possible. I won't complicate this more with the other accellerator input.