The c-36 we are buying has a total mis match of insturments.

I would like to convert most to raymarine ST-60 stuff.

My question is:
The boat has a signet speed and depth, with the through hull in the head in front of the keel. I like it there.

If I change to the ST-60 tri data, can I use the same through hull and or location?

If not, can the new through hull for the ST-60 tridata be done while the boat is in the water? and be installed in the same basic location or would having 2 though hulls weaken the area?

TIA

Bob