MAQ00360 What PTT can I put on my 1984 115 hp Mercury inline 6

Hello all , sorry about the mess I am just finishing up a remodel of my house and I have construction and demo scraps everywhere right now . I am slowly but surely getting this motor ready to power up my river boat. I am running a jet and would really like to add PTT to this motor but not sure what will work or what I will need to change this manual out to PTT. To those who really know , I could use a little of your knowledge on this ! Also will be making a few more videos as I chase down the reason for power loss in the water . PO said that he got it running good then when he tried to run it there was a power loss and could not develop enough power to plain his boat so he sold it to me ! compression is 120-130 all cylinders.
So I can use all the help I can get . Thanks for lookin ----