Analog tach for yamaha tiller?

Hey y'all, long time reader, but now finally have a reason to post. I finally decided to get a new boat, and hopefully it should be started soon up at Ankona. I'm wondering how diffucult it is to wire an analog tach into a 99 Yamaha 25hp 2 stroke. I'm pretty sound electrically speaking and know a bit around my motor - i just would rather have an analog tach over the tiny tach for a few reasons, but will stick with the tiny tach if its going to be that diffucult to set up an analog. Thanks for your help and let me know if I put this in the wrong sub forum.

Look forward to sharing my progress soon!