Pat-
Regarding the tach, it’s hard to say.
Some tachs have a switch on the back to select multiple cylinder engines.
If you can get a hall effect or other type of switch sensor that has the sensed element spinning on the motor shaft, you could at least sense motor speed or some fraction or multiple of it. If you were real lucky it might give you prop speed at proper scaling.
-MT
From: electricboats@
Sent: Saturday, May 22, 2010 6:58 AM
To: electricboats@
Subject: [Electric Boats] Re-use of gauges
After removing the 40 hp mercury engine from my pontoon boat and replacing it with a Torqeedo, I find myself with three perfectly good gauges on the console that do nothing. Does anyone have any good ideas for using them in some useful way?
The volt meter is easiest. I connected it to the separate 12 volt battery I use for the navigation lights and horn.
The fuel gauge is next. I thought about recommissioning it as a volt meter for the 48 volt pack. I could create a set-up that causes it to go from empty to full as the battery bank goes from 48 to 51 volts (or whatever the right numbers are).
The third gauge is a tach. It would be nice if it could measure prop rpm's, but I can't think of any easy way sense that.
Any ideas for using the current gauges or replacing them with other gauges of the same size? (The tach uses a 3-3/8" hole while the other two use 2-1/8" holes).
Thanks,
Pat
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