Deere 300 tach?

[Mr300]

Looking to put a tach i a '77 300 with the Kohler 295. As it's a points motor, what tach do I need? Harness has a 3 prong connector which is currently unused, but I found a tach online which matches the JD part # for this sled. It has three separate leads however? Anyone able to check for me as to how one is wired up? TIA

[johnnycyclone]

Mr300,
I'm pretty sure you want the one with the 3 separate leads for your sled. I have a copy of the installation sheet for that tach at home, which includes the correct wiring, and the list of sleds it fits. I will check for you tonight and let you know for sure.

Terre

[johnnycyclone]

Mr300,
According to the online John Deere parts catalog, you would need a tach with the part #AM52346. The installation instructions for that gauge only specifies the 1972, and 1973 models along with Spitfires and Trailfires. It has the 3 separate leads, the yellow on the tach goes to the yellow wire connector on the main wiring harness, the red wire on the tach goes to the brown/white wire wire connector on the main wiring harness, the yellow/red tach wire goes to the brown wire connector on the main wiring harness. Hope this helps.

Terre

[JDT]

Any 300 tach will work ie 74-77.
What will not work is 76 and up Liquifire and Cyclone. Or any tach from a Reed Valve CCW.
The 72 tachs have a chrome trim ring and will work but do not look right next too a black speedo.
Any gauge from a 73-74 400-500-600 would be the same also.

Don't forget that you also need a black wire (ground) that usually is jumpered over from the speedo. That is four wires total for the tach.

[Mr300]

Awesome info, Thanks guys! Just what I needed to know.