ST40 depth and new system (i70, etc)

I currently have my depth sounder (part unknown) and it is displayed on the ST40 on my helm.

I am upgrading to an A12 and 2x i70s, and the CPT120 thruhull transducer - however, the transducer will not be installed until winter layup.

Is there a way to tell what depth sounder I have (since we know it works on the ST40 display) and if I'd still be able to get depth displaying on my i70 - or will I need to keep the ST40 in for the season until the new transducer is installed?



Thank you