Upgrading to Tacktick

[lawko]

Hi there,
Two questions

I have a 1994 Beneteau 265 with a Autohelm ST50 speed and depth and im having issues getting it to power on even with 12v going up to the unit.

I recently replaced the speed transducer with an airmar ST850-P-FISO. The depth transducer is original as far as i know and im unsure what the model number would be.

I currently own the Tacktick T101 system that has wind speed/direction.

I would like to upgrade to the wireless speed/depth system and i believe the 2 components i require are:
T111 Multifunction wireless dual display
T121 Hull transmitter

Will the T121 Hull transmitter accept my airmar ST850-P-FISO transducer and the stock ST50 depth?

Thanks