Thanks for all the help guys, it was much appreciated and was another great learning experience, the camera is now wired up and working, discovered how the back of the roof lifts up and now know where to run the wires for the coolant alarm too so that'll be much much easier when i do it, they seem simple enough, stick the sensor to the tank, stick the speaker where the driver can hear it, and find a 12v switched supply, winner.
Anyway, here's the camera poking out;

(Don't worry i'll be putting fresh plates on her at some point, just need to decide if i'm changing the reg first then i'll get some recreation dealer plates made up)
Thanks again everyone, i'm incredibly grateful for the guidance.

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