Thanks mate!
Now I know how is it!
I'm thinkin about using a single switch that when pressed just turns off the car by the Injection pump and then I'll bump start it!
On traffic lights I'll use the key!
But at night for example if you turn on the car with the lights on it may blow one out, so there has to be a way of auti turn off the lights with a second button to turn on the car without key by pressing the clutch for example. A relay should work it out!
Once again thanks for your help! As soon as I have some time to it I'll make it work, for now colleage is in first place!