If I'm not mistaken, U can get one at electronics shop. Not the one selling audio equipment, but those selling elec. components like resistor, capacitor, rechargable battery etc. Get the one with battery charge indicator.
I Have an alfa engine that is drive by wire - Bosch Throttle Body & Pedal. The engine is being modified & the Stock ECU that controls the Throttle will be replaced, so there is no throttle control.