Yup, 2 pulse. If you browse tachs on ebay you can usually figure out which ones will work for you even if you don't buy there. I put a tach in my Widetrak when it never had one in the first place and it was remarkably easy. Wished I'd done it sooner. Then sold the sled like two weeks later. Oh well.
I did buy this tach kit on ebay, and it was listed to work on the 340. The seller must have made a mistake, or did not know which tach was the right one. So now I have two brand new 6 pulse tach's that I have no use for if anyone needs one, let me know.
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