I've built a cafe racer but as I've removed the clocks etc I have no speedo or temp gauge now.
Does anyone have any idea of how I can add these without to much wiring or big units. I'm trying to keep the bike as minimal as possible

Tyetye, do a search of the Forum. There have been a few posts on this very subject.

Read through the search results. If you are still troubled, ask some questions.