Very interesting I made one inside the change lever but without integrated circuit it really screwed it is to put the censors as there says in the empt of the lever and that the system is properly works for this system for a truck or a bugui but when you want to put an astra I swear you will complicate a lot, it is best to take out the box and bring the holes with the censors and place the censors and place the censors in So ise and is Barbaro ..
It is a good support of IC ... The 5 volts you get them with a 7805, or with a 5.1 volts in reverse, for the most recommended case the second for the low consumption pens.
Very good, although in the scheme you have marked the stroke of the march R to 1 instead of a mass. In addition I would suggest that you added how to get the 5 VCC in the car for who does not have much electronics idea. Thanks for sharing it.