no gauge activity >>> Check the ground wire to the engine. The gauges need a panel ground. The start , stop and glow plug functions do not.
Stop Button inoperative -- Connecting wires behind button does not stop motor -- I have connected 12V to stop solenoid and it functions >>> Check the white/black wire between the panel and stop solenoid for continuity.
Beeping stops when I raise RPM a bit >>> Check that idle RPM is 860 RPM minimum.
Call the office if you have any more questions.
__________________
Best regards,
Farron
Technical Sales and Service for Beta Marine, US Ltd. Minnesott Beach, NC PH: 252-249-2473 farron@betamarineusa.com