Outer Limits 4x4 Board

I'm here again with a couple of new questions, I hope somebody can help my.

1)It is possible to replaced the tacho (with clock) of my MK SD33T with a tacho of a MK RD28T (with rpm meter)? If is possible where should I connect the rpm meter to the engine?

2)Which is the right pressure of the oil in the SD33T motor, my shows 6 kg/cm2 is this to much?

3)Where are the bolts to drain the oil from the T-case and transfer case and where are the bolts to fill them up again?

Thanks for the help!