Engine hours counter

Thanks for that.

Thinking about it I am sure the key has two positions so I'll work out how to wire it up as per your suggestion.

After I turn the motor off I'll have to remember to turn the starter key off but I suppose I can have a prominent red light to indicate all the warning lights, fuel gauge as well as the engine room blower are still "ON"

Easy to get key switches with various arrangements, including a heat position if you want one. Possibly not in WA.
 
They definitely need a 12v supply, the sender is clamped onto an injection pipe and senses the pressure pulses. I fitted one to my previous boat which had no engine instruments at all.
 
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