Help needed wiring period tacho

I bought this off the Forum but came with no instructions. Anyone can assist?

unfortunately you would need to pull the gauge apart to see where the connections are made with the wires... then you can tell what gets wired to what.

its easier to go to an auto elcetrician and ask them thats what i did and got the job done cause its hard to interpret these things!!!
cheers
rhys

Anyone else guys?