Yamaha tach help

[Baitweller]

Hey guys, I had twin ox66's on my boat with all the factory Yamaha gauges. I now installed a pair of 2005 F-250's. The guy at the dealer told me to adjust the 3 dip switches on the back under the rubber cap. I only see 2 switches, not 3?? My original motors were 1995 ox66's. Do I have too old gauges and they wont work or am I missing something besides the 3rd switch (joke).
Thank you all
Baitweller

[rodbolt17]

they wont work correctly with 4 strokes.

[Baitweller]

Tach help

Rodbolt17, thank you very much. I sincerely appreciate your help.

Baitweller

[99yam40]

I do not know for sure but you might get some info through to the old gauges but not all that the new ones will. depends on what you are looking to get

posting what gauges you have might get someone to respond on what they would show and what they will not