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yup, 1977 Cat 30, no. 664.
yes, the meter has three wires:
hot - should be connected to constant 12 volt power - it's ok if this wire is cold when boat power is off - it just provides power when needed. I made sure to double check that the meter retains engine hours in memory, and does not go back to zero if all power is shut off, like radio station memories do (another story for a later time!).
sending - should be connected to a 12 volt power source hot only when the engine is running - this is the coil connection. I think it's hot even when the engine is off, if the ignition circuit is on - but since this is never the case on my boat except for very brief periods, it's not an issue.
ground - obvious.
Best place I can think of to mount it in our boats would be at the end of the galley counter, as high up as possible, opposite from the chart table, making sure to keep the wiring clear of the drawers in the galley console. If there's enough clearance between the back of the gauge and the sides of the drawers - not sure.
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