I want to make a Mazda Distributor like a Datsun

[240260280z]

I'm trying to help my dad with his herd of Mazda B2200 trucks. I picked up a DGV and wish to make a simple workhorse that has just a carb and a self contained ignition system (battery, key, coil, distributor, igniter) like one can do with the ZX distributor swap.

The early B2000's (pre-84) seem to have this possibility but post 84, the B2000's 2200's and 2600's get progressively more complex.

There is a late 80's period where the ignition looks like this:

The question I have is: Does the igniter in the distributor sink the coil -neg to gnd via the distributor body (not shown) or does the engine-speed-control-switch act as the ignition module and sink the coil -neg to gnd?

Thanks

[Zed Head]

Isn't the rectangular box the ECU? Looks like a Nissan ECCS system with the ignitor on the coil and the YEL/GRN wire as the amplifying signal wire. The two wires from the distributor would probably be LED or Hall effect since they're powered from the coil negative post. The sink would be on the coil/ignitor bracket then. "Engine Speed Switch" looks like an input to the ECU, with the drawn line missing or on the next page. And the instrument cluster would be the tach, counting current pulses on the coil negative side.

Just some guessing.