16" or 18" fan?
1" is more than enough room for a shroud and you're likely gonna need it. The one I used is only1/2".
There is always a way to make temp senders work, you don't need 3 of them. In most cases you can set them up to share the same sender.
If you go EFI and Dakota Digital for your dash, it's the easiest since you can get a BIM unit and have all the efi sensors send the data to the dash.