I am using the winter time to review and upgrade my electric system, swapping for LEDs and adding a battery charger controller, among other things.

For safety, to avoid potential power spikes damaging the installation, there is "start Isolation" feature connecting the start position to the new battery charger (BlueSea charger 10A).

I looked at the documentation in the Laser 28 manual to find the different start key positions but couldn't make anything from it, as it refers to labels A, B, C, D which are not documented at the back of the key switch.

Would someone be able to point it out to me on the pictures attached?

I would also want to power the oil temperature gauge (on the lower left part of the picture "Back of engine panel 3.jpg" directly through the key switch, keeping it working only when the engine is on (it was previously powered by the instruments power cable).

Which pins should I use on the key switch to do that?