speedo wiring, which wire is which

[tweeqd]

hello all, ive fitted a chimaera speedo unit in my car but cant find any diagrams for the 3 wires anywhere

does anyone happen to know which wire is which of where i might be able to find a diagram
thanks martin

[JonyTVR]

http://www.shengltd.com/tvrextras/docs/SpeedoSenso...

there is a pic at the bottom of there that might help. note though there a a few different types of speedos!