Regal 3300 Owner's Manual page 109

Catalyst Engine Monitoring Panel
SD
side and a warning sign on the right.
When an emissions related fault is detected an amber colored light will
appear on the left side.
When an engine related malfunction is detected the warning sign will
light red on the right side. If the situation is serious enough there may
be a significant power reduction of the engine.
If either of the above lights is lighted an audible short beep alarm will
be activated.
When the engine is initially started there is a series of self-checks
involving the various emission system sensors.
Read the engine manufacturer's operation manual for more detailed
information on emission monitoring systems related to the particular
engine brand installed on your vessel.
https://www.boat-manuals.com/
Engine & Controls
Shown is a typical dash mounted engine
emission status panel used with
catalyst engines. It provides a visual
and audible (beeping alarm) means of
monitoring engine and emission
control systems. The panel will show
the outline of an engine on the left
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