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If no switches on the back you have an antiquated gauge. Time to pony up for new one.

Something leads me to believe that the gizmo seen on the cam shaft for a Mercury Marine 3.5 four stroke model is related to the compression release mechanism.

Don't know if this AI is true or not.

All alternator regulators have diodes that prevent the flow of current from a battery to the alternator. I don't see a problem running both motors at the same time connected to the one battery. Each battery will contribute a bit of current to the battery. But as the man suggests, if there is...

I don't know personally that your motor uses a decompression mechanism. My comments were based on you saying that it has one. Have you thought about the possibility of a lower unit problem causing the motor to be difficult to pull start? Easy enough to remove the lower unit and then use the...

If the compression release mechanism is not working that might fool someone into thinking the compression is excessive.

Depends upon the ignition system.

I think testing without the motor being loaded is somewhat problematic.

Very true. Using battery current to produce current to charge a battery.

Diagram from Evinrude showing two motors providing charge current to one battery.

Diagram from Yamaha showing two motors providing charge current to one battery.

Many twin engine airplanes have but one battery. To save weight. Both alternators (one from each motor) charge the battery at the same time.

There normally no over compression. It is just that normal compression makes a four stroke motor hard to pull start. A decompression mechanism momentarily prevents full compression when a starter rope is pulled.

When you use the term NICO are you referring to what I know as a Noid light? Light flashes as the ECU completes a ground to an injector?

Correct when the key is in the On position.

Mercury Marine has approved a number of models for use with lithium batteries. Although not approved by Yamaha, Suzuki, Honda or Evinrude, a number of owners of those brands are using lithium batteries with no ill effects.

In two stroke mode it monitors quantity. In the four stroke mode it monitors pressure.

If a Yamaha multifunction gauge change it from the two stroke mode to the four stroke mode.

Would both alternators be used at the same time or at only one at a time?

Should be no problem whatsoever. What will be powering the inverter? Not understanding protection of the Suzuki charging system being needed. Why?