is there any electronic geeks in here or someone that knows about turbo timers.
im after making one. im able to make my own timer circuit using the old 555 chip and a few resistors and capacitors etc but does anyone how to integrate it into the ignition circuit on the car..i would imagine that it would have to go through a relay cos of the current...
my car is an astra diesel.
since this has a wire going to the fuel soloniod i think this could be some sort of trigger but how do i make it turn on with the ignition off. ie when the keys are out.

i dont suppose someone has had one fitted reciently have they?

any help or info would be much appreciated...

many thanks
chris