Re: Tohatsu Hour Meter
To get to the ECU data, you need to enter diagnostic mode. The procedure is in the Factory service manual.
In order to read all of the data, you will need a Factory TLDI tachometer.
If you have an aftermarket 12v (glorified clock type) hour meter, and just want to keep an eye on hours to schedule service, you can do that by turning the meter "on" with the lead that energizes the ECU. Then the hour meter will run any time the key is "on", even if the motor is not running.
The complete wiring diagram and information concerning each individual wire is in the Factory service manual, available at any Tohatsu dealer.