Wiring a Schneider Tachometer into 1982 Mini

[jonnyalpha]

Hi;

I need a little help wiring up a Schneider (Made in Japan) Tachometer into a 1982 HLE 1000 Mini.

Here is the Tacho:








I guess the yellow wire needs a switched 12v feed for the bulb (does the body of the Tacho need to be grounded for the light, or will it get its earth from the black wire?)
Where do I wire up the remaining three wires:
Black - Ground
Red?
Blue?

Thanks 

[Rich]

red will be ignition positive, blue will probably be an impulse drive, usually the CB side of the coil. Bulb should earth through the tach on the black wire.

[jonnyalpha]

After looking through a couple of wiring diagrams I found a couple of spare cables off of the loom in the dash. Connected them up and the Rev Counter appears to work fine :-)

Thanks

[hario]

Yellow would be switched from the lights circuit