GAS GAS Trailtech Vapor Speedometer sensors

[dimtsam]

Hello everyone
I got a GG EC 250 2011 and there ' s a Trailtech Vapor on it. But the cables are cut off. And there are no sensors...I need help to identify the cables coming out of speedo. I know which pair is the Power.
The engines temperature sensor has 4 wires? Can I replace this sensor with an other except Trailtech's because I think is too expensive?
Is there a cable that goes to spark plug?
I need any info that you can give.
Thanks a lot

 

[dimtsam]

After contact with TrailTech I finally found out the answer. So I'll try to put some infos here in case someone else need this.

The speedometer

 

[dimtsam]

The first cable from the left with the connector is connected to Power 12v. The second is for tachometer sensor. The third, which is red marked, is a 4 wire cable that is connected to remote switch (which is no longer available). The last cable is for engine temp sensor.