Wiring a RAC GT Tach

I have seen the link referencing how to wire a RAC GT Tach in another thread. I tried to look at it today as I was getting prepped to wire the tach and the link is no longer valid.

Wires I have on my Tach are:

Black

Red

Blue

Green

Yellow

What goes where?

Thanks for your help.

 

I believe ,Red 12v,Green coil negitive,black ground,Yellow Tach light power 12v, Blue ground for tach light. All this is for 12 volt negitive ground