Car engine running detector for GPS cars

This device is in communication with a car satelital tracking system and allow know remotelly when the engine is running or not.
Is based in the detection of oil pressure, and battery charge.
On this way can work even in old Diesel engines that have not electronics.
Was maded with a circuit that have 3 input, 2 outputs and one communication channel that allow great variety for different uses.
The challenge on it was get high production in very few time with high reliability.
The small size allow hide in almost any place of car