Edit......I'm not psychic or anything but you have a 351 with a carburetor according to my friend Carnac, so there are no stored readings in an ECM or anything like that, that'll spit out any information for you but you already said that on Planet Nautique.

Carnac says you're thinking about cannibalizing 2 gauges to maybe make something that might tell you the hours?

  https://imgbb.com/" rel="nofollow">

PS.......Carnac checks out Planet Nautique every once in a while 

Giving the same info here would be nice  

https://skidim.com/hourmeter-black-2/" rel="nofollow - LINK

Hook it up to a 12 volt source for the appropriate amount of time to reflect the actual hourss showing on the old Tachometer.  You could either add a hole on the dash or replace a not-so-useful gauge like the clock.

JQ

Umm Johnny..........  his gauge is broken and he has no idea how many hours are on the engine 

That's what he's trying to find out one way or another before he does anything else like a new gauge

Well spotted! So yes, I just purchased a 2000 SN, with a carb'd 351W, and no perfect pass. So the only record of hours on the boat will be in the teleflex RPM gauge. I took the gauge I have apart, and found it is two boards that plug into each other:

It looks like the display board might be just a display, and the memory of the hours is in the other board. From what I have read, it is the display that goes out on these. So maybe, if I swap a display from one that can even just barely be read onto my other board, I'll be able to read the engine hours!