I want to put some lights in my shifter but I want it to be proportional with the amount of throttle being used. How can I achieve this? I know how to make it light up but I don't know what kind of switch I should get or what it is called at that matter. Basically I want a 12v switch that if 25% is pushed in then only 25% of the LED will emit where as if 75% is pushed in then 75% of the LED will emit.

If this doesn't make sense then I wrote this too my teacher who helped me out with creating of the **** in the first place. He is also the electronics teacher and I think I described it better here:

I came up with an idea but I am not so sure it is possible. I want the current to the LED to be proportional with the amount of throttle being used. Basically a push button switch will be connected to the accelerator and when accelerator is depressed so will the switch's button. The switch will then change the amp current based on the amount of the button is depressed. Basically I want a 12v normally open button switch that is directly proportional with the amount of depression on the button to the amp current flowing through the LED. But first I am not sure if it is possible to dim a LED like that? Is it always on/off or could it be dimmed?

I was thinking about it and normally switches are either open or closed but a potentiometer has the same idea BUT I have only found them in the rotary form and it doesn't control current but only resistance from my knowledge. I don't know much about electronics but maybe you can use the potentiometer to resist/block some current from going through?

If you could help me that would be great.
Thanks,
Justin