Oo look its got a gauge for the kettle water temperature too.. Seem to need to register .. up to you .. but a lot of diagrams with wire colours can be seen behind the popup on my phone.... googled "4 in 1 tacho" .. http://ac.vrnexus.de/4-in-1-tachometer-wiring.html Maybe not so useful, but eventually you can dig the info out of googling slight variations on the question.. An aussie on eBay sells them with their sensors.
