Technical Drag Fast tach wiring

Anybody know the correct wiring for a Drag Fast tach. Has three wires (blue, green, and red).
thanks

 

I need to Know too !!

 

You might try this,, HRP

<cite>www.tradervar.com/Drag'nTach.pdf</cite>

 

Blue is likely for the light bulb.

 

Blue=lights Red =12+ Green to neg side of coil.

 

\I pulled the cover off the back. my blue wire was broken off the circuit board. It lookes like the red wire is for the light , green is PROBABLY ground and Blue to coil , dist side. My guess from looking at the components,

 

Just got back on this today and I know it has been awhile. The wires were as follows: Red--positive, blue was the ground and the green went to the coil distributor side. Hope this can help someone else who might have one of these old tachs.