ST 5000 updrade to EV 100 T70154

Can I change out the ST 5000 unit install the new P70R, ACU and EV-1 Sensor and use my old drive unit? My new EV 100 T70154 was delivered yesterday.

I have a 24' workaround with a 225 hp Yamaha outboard.
I have ST 5000 in good working condition with a rudder reference replaced last season.

I have RL70CRC. I do not use the autopilot to steer courses. Its sole purpose is 2.0 mph trolling to a set course heading.