On your diesel engine the tacho works by counting pulses from the W+ connection on the back of the alternator, so the number of cylinders is unimportant. What is important is the size of the alternator pulley as this effects the speed of the alternator and therefore the tacho reading.
As for fitting extra seats, have a look at your compliance plate for maximum seating. What you can do and what is legally allowed may be two different things.
Deano![]()


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