Thanks for your reply.
Sorry, I did mean a p58. To be specific it is this transducer:
Raymarine A102138 Fishfinder Transducer P58-RAYA | Blue Heron Marine Electronics
It has the same wiring diagram that I linked to above. Airmar's PDF doesn't match the color coding properly and shows a 9 pin connector.
I actually do have depth working now, using the old 300khz only transducer. The e7d identifies it as a 200khz transducer and is working fine. Black and blue are wired to the old thru hull transducer, brown and green are wired to the P58, and nothing else is connected.
The e7d seems to want to see something on sense to know that a transducer is connected. I will do more tests and report back.