But I will also offer up one caution. Some years ago, perhaps 6 or 8, Sea Fire released a new automatic shutdown control. It's a gray box, where the previous incarnation was a black box. The gray box device is an utter piece of shirt, with an incredibly high failure rate. Mine failed, and I know many people first hand who have had similar failures. And the killer is that when it fails, it completely disables the boat. When mine failed I was lucky to be at the dock because it incapacitated my main engine, wing engine, generator, and thrusters. Had I been maneuvering or trying to dock, I would have simply lost all control of the boat and drifted into whatever happened to be in the way.
For those interested, the newer gray-box SeaFire control unit has an internal power supply that powers all the control relays. The relays are always active to enable the engines and fans. This is an appropriate dead-man design. The problem is that the power supply is poorly designed, runs hot, and fails pretty reliably within a few years. Mine failed at about 4 years, and i know others who have had failures earlier.
This has been brought to SeaFire's attention and they have basically done nothing to address, so on our next boat I've switched to FireBoy who have a much better product anyway.
The gray box SeaFire comes in three configurations of 8, 6, and 4 relays. Anecdotally it seems that the 6 and 4 relay boxes are less prone to failure, and that makes sense considering that the power supply only has to power 4 or 6 relays rather than 8. But if you have an 8 relay box, your days are numbered.