It is a two prong gray connector. I called the eagle people and she said they also have gray coonectors for the newer models but they would not fit mine. She gave me this number for my model 90-36 and said they sell them for 50 bucks. I really do not want to spend that much as i got this thing from a yard sale for a few bucks and I could get one off ebay much cheaper but I do not know which one to get.
Have you verified the head unit works?
It should turn on with out the transducer and you whould be able to go thru the menu.
If that does not work then I would not spend anymore money on it.
Some models with out the transducer go into demo mode but you should still be able to get into the menus and hake sure it works before buying a transducer.