If there are no instruments installed as you mention, I would say a wireless system such as Tack Tick (now owned by Raymarine) is the way to go. The installation is very easy, especially the mast head wind instrument as it does not need a wire down the mast obviously. The Depth & Speed are hard wired to the transmitter but the instrument heads are wireless so mounting them is as easy as hanging a picture.
The cost is slightly higher for TT than wired units of similar capabilities but you will save some $$ on wire and installation cost if you were to have someone do it.
I have been very pleased with my Tack Tick T104 system. There is one anchorage where the mast head go out for a brief period, there must be some type of disruption to the signal there, weird. The solar charge on the head unit will keep them going 24/7 even with overcast skies and use of the light at night. My most extended use of them was about a 2 week cruise in which I never turned them off and the battery meter never went below half, with several days of overcast skies.
The TT also should integrate well with other electronics and the TT offers a wide variety of screens that when connected to a GPS can provide allot more info, ha, just the other day I found a setting that will tell me the date & time
Still learning how to use them. The Wind Unit has a nice feature for close hauled sailing which I think is unique to TT and useful for racers.
Maine Sail has posted that he has observed the TT units to be troublesome, you may want to PM him for some more information, he will certainly not recommend them.
Another drawback of the wireless, someday I am going to have to replace the batteries. TT said about 7 years, so I have about 4 more to go I suppose. I may find that the cost to replace the batteries is not worth it, dunno, we shall see.
As mentioned, considering you have no instruments installed, you live where I am guessing solar would operate well, I would really consider wireless, Tack Tick or others.
Good luck, PM me if you have anymore questions