Hooking up gear position to M400

[lawnmower]

Hi,

I need to hook up the gear position to the ECU and would like to do this via an AT input and the voltage based gear detection.

I have 3 gears and each has its own soleniod so I have a seperate 12v volt feed for each gear. If I can regulate the voltage to the ECU from each solenoid it will recognise which gear is engaged right?

So can anyone tell me what I need (inline diode? etc. etc) to limit the voltage in each gear to set this up?

Thanks for your help.

[lawnmower]

I have done some research and I think its resistors I am looking for?

[Holmz]

I have done some research and I think its resistors I am looking for?

Maybe one of these if it can wrap around the gear shaft?
http://www.celesco.com/stringpots/?gclid=CJPw1Nah268CFQFKpgodHU2KEw