er how about one of these, not fantastic but will work!! you may be able to get one in NZ if not ask him to ship and if you are still having problems and you want it i could forward it on for you!!

http://cgi.ebay.co.uk/DIGITAL-SPEEDO-REV-TEMP-SENSOR-SUZUKI-YAMAHA-KAWA_W0QQitemZ8038736194QQcategoryZ10534QQrdZ1QQcmdZViewItem