Hello I will help you with your question,
The procedure with the timing diagram is below, look it over and let me know if you have further questions
Click here for procedure
The plug for the pump shaft is along the front of the engine behind the manifold about 1 inch above the oil pan rail.
The marks for the balance shaft are clear on the sprocket, the sprockets are keyed to the shafts. I agree that Mitsu's diagrams leave a lot to be desired.
Let me know how I can help you
The balance shaft/oil pump has three possible positions when the mark is lined up as the shaft is gear driven three to one.
You can actual spin the pump gear and it will settle near the correct position, if you bring it to the mark when the shaft is not in the correct position the gear will try to turn off the mark. Pull the bolt that does not hold anything on the front of the block and use a probe to be sure you are in the right position. If you are not you will have a slight rough idle but at 60 mph it will feel like the engine wants to jump out of the car.
Once you have the belt timed correctly all the marks will come back into alignment every 12 revolutions of the crank.
Let me know what further questions you have.
Glad to help and thank you for using JA! again.