Ive never seen a manual for one, its safe to say most of what you might need to work on is pretty similar to the turbo cars' kit people post pics and guides for on here. if you ever need help with anything just ask, this forum is probably the best ive been on for helpful friendly advice!
if your temp gauge is sat steady at that higher temp id expect someones put a high temp thermostat in or your rad is either a bit blocked or missing a lot of fins! for reference, mine sits steady right in the centre, only creeping up temporarily when i come off the motorway.