2004 200 hp Hpdi's

[Fishchaser28]

Hi new to this site. I would appreciate any help with this. I just removed a pair of 1991 150 hp Yamaha outboards from my boat and purchased a pair of used 2004 200 hp hpdi's. My question is will I be able to hook these engines up to my existing Guages and harnesses and key switches or will I have to swap them out?
Mike

 

[99yam40]

I would swap to the newer ones, but I do not know if the old ones would work without some strange rigging

 

[Fishchaser28]

Thanks for the reply.