73 Tri-Cabin, unknown gauge

[mike&sarah]

73 tri-cabin, Chrysler 400s, can someone tell me what this circled gauge is for? Please and thank you.

1C613770-31CA-4B5B-A2AD-0E1448ABD8EC.jpeg (68.34 KiB) Viewed 2085 times

[prowlersfish]

Speedometer.. Not factory.

[mike&sarah]

Thanks for the reply prowlerfish - have you seen these on a boat before? I haven’t tried to index the “mileage” distance (how would that even be measured?) to the hour meters, but it seems like 7,500-ish miles would be…oh I don’t even know.

I think it’s one of those things I’ll just have to be satisfied not knowing…

Maybe I’ll replace it with an altimeter

[prowlersfish]

I've seen plenty of speedometers over the years, most without an odometer and more on smaller boats. Nowadays, they're kind of useless with GPS that can tell you speed and log the miles, too. And a GPS can be set at Knots.

If you were to average, say, 10 mph, that would be 750 hours. Running slower would be more. Faster would be less. Idling in the slip would add hours, not miles.

The question is when was it installed vs miles on it now. Almost no one asks how many miles on a boat.

[mike&sarah]

I’ve seen speedos too, and had them on every one of the handful of smaller boats I’ve had. I’ve never seen one on a boat with an odometer and a trip odometer - it’s curious to me boat has 590 on port, 605 on stbd, not sure of hours on Onan.

I’ll prob just clean it up & keep it connected