New F90, multi tach still shows old hours.

[CatCam]

I just had a new 2022 F90 installed to replace my 2004 F90. I reused my old Yamaha multifunction tach. My old tach shows the hours from my 2004 motor. Is there a way to reset this to zero for my new motor?

Thanks!! CatCam

[fairdeal]

No, sorry, there are two versions of the classic Yamaha multifunction tach;
your old tach is the "6Y5"
and the way that works, the gauge itself contains the "clock" of engine running hours;
it "has no idea" what engine it is connected to,
or how many hours that engine has run.

If you don't want to keep using the old tach
with those already-accumulated hours,
you have two choices:

- buy a new 6Y5 tach, which will start at zero when you install it
(missing however many hours are already on the new F90)

- buy a 6Y8 multifunction tach, which resembles your current tach,
but has much more capability,
including displaying the actual engine hours that the new F90 has run.

https://www.boats.net/product/yamaha/6Y8-8350T-20-00

The 6Y8 tach will fit in the same hole,
but will also require some additional Yamaha wiring between it and the engine;
it uses different wiring from that used by the 6Y5