The other method depends on if you have the port on the side of the fuel injection pump to fit in a timing locking pin. They are fairly cheap on eBAy these days.
You can get some idea what is going on in post 2. The timing locking pin locks the fuel injection pump camshaft in place so it cannot easily move during insertion of the fuel injection pump. However, it does not lock it in place in a position of the timing marks on the front of the fuel injection pump.
This is going to kind of a mind bender.
On my 84 300D turbo when you are using the timing locking pin you turn the engine on the direction of rotation on the compression stroke and instead of lining the pointer up with the
20 something degrees before top dead center you keep turning past top dead center on the compression stroke and
stop at 15 degrees after top dead center on the compression stroke.
You stick the pump in centering the studs in the kidney slots and blot it down. Before to remove the timing locking pin, add some clean oil through the hole and replace the hole plug.
The mind bender. Why 15 degrees after top dead center on the compression stroke? It has to do with the construction of the governor and or fuel injection pump cams shaft. It is just where Bosch put the sort of tang that sticks out.
Using the inj. pump locking pin
I am just adding this. That port and the tang on the camshaft is what is used on some of the other fuel injection pump timing methods. I am not going into those.
Anyway, the emission sticker on the car has the timing specs, if it is still there.