They are the same. The SR Systems Monitor does not interface or monitor the engines for the boats with computer-controlled engines. The Owner's manual shows a lot of engine related interfaces but they are not used.On the 58 I think the system monitor is different than the 52. The system monitor on the 58 does not provide engine data as it appears to do in ttmotts post and on the 58 the engines ecm provide the data to the mmds displays and not the systems monitor. I’ll reach out to Lauderdale compass and speak with Ariel he should be able to provide some insight. I’ll report back