I just went ahead and ordered the 1885 unit. I will send the other back when it gets here. While we are on the subject I wanted to put the crane unit (xr700) I believe in my 6 cylinder 280se. I saw that the bloke on Mercedessource recommends it highly. It comes in at around $130 with extra install instructions from him. Any experience with this unit?
Thanks guys for all the help.
Probably the safest route. Only thing to be aware of with 1885, is not to leave ignition key on for very long without engine running. It's not something we do very much, unless trouble shooting so should not be a problem. If you do need to leave key on, disconnect the Pertronix red wire.
Seeing you were only concerned about the green wire, there is no need to bypass the ignition module (aka Switchgear). The 1885 will just replace the points. If you want to bypass switchgear later and add a Flamethrower coil, then that can be done with a small wiring change.
For the simple points replacement, the red and black wires do not go to the coil. The diagrams in this link
are for an early djet but principle is same for all. Be sure to run a ground wire from the body of the distributor. It can go to the battery negative or perhaps to a chassis ground located just below the coil.
If you decide to bypass the switchgear and change the coil, use the diagram that shows the switchgear bypassed.
Regarding Crane for your 6cyl 280SE. I have no first hand experience, but it does seem popular for some cars. Especially those where Pertronix doesn't fit the distributor properly. But another Pertronix may be the way to go rather than learn about two systems? Looks like they have two options depending on year of car.