76 Cyclone Tach wiring

[sledstorm]

I am trying to add a tachometer to my 76 cyclone 340. I picked up a NOS AM52346.
It has a yellow lead for light, and two leads for the tach. According to my wiring diagram, the yellow/red wire should connect to black, and the red should connect to brown on the sled. When I connect it this way the tach reads high. Maybe double what it should or more. I connected to the brown circuit at the wiring block.
Any ideas?

[farleyjd400]

That part number comes up for the mid mount snowmobiles with points ignition. Does the tach have a fuse in line of the yellow/red wire? If it does not then it will not work for you ignition

[sledstorm]

No fuse in the line. The instruction sheet has 73, 74 listed, and then Spitfire and Trailfire.

[sledstorm]

So I believe the 76-78 Deeres used the AM 53193 tach. All others are not compatible. Maybe its a 2 pulse vs 6 pulse thing? Anyone know?
Are there any other tachs I can use on my 76 Cyclone?

Thanks

[JDT]

Sledstrom you are correct. Not compatible.