The problem I have is that the system is half system... The trhu hull transducer (The one I supose is for depth sounder) and the other one (indeed with a wheel, not installed) are there without any instrument... The plan is to test them and if they work, maybe if it's possible and affordable, I will complete the system with instruments.
The major issue is that my boat is in Valle de Bravo Mexico and we donīt have reliable yard, so most of the work is DIY projects.
Later, when at home I'll post a picture of the transducers and hope someone can identify them...