Mike, remove the rear upholstery panel in the rear of the compartment, which is in front of the helm. You can reach the tach by stretching your arm up behind the steering wheel. The tack has a threaded ring on the backside that you should be able to take off by hand.
I have a 2010 Sundeck 260 with 350 DTS mercruiser and Bravo 3. I just had the Smart Craft Gauge refurbished and the calibration of the trim does not work. Trim gauge was not working properly before. Now The trim gauge indicates either fully up or fully down. I’m guessing The trim sensor on...
the button in these schematics look like the Switch. It’s somewhat triangular in shape because the trailer button is included.
Remote Control-DTS, Panel Mount (883465A1)
Remote Control-DTS, Panel Mount (892984A01 and A02)
I had similar problems (would not trim down) and traced problem back to a bad trim switch on the throttle. I took throttle apart and jumpered between the purple power wire and the green trim down wire and trim down worked. I cannot find a part number or the switch anywhere on the net. 2010...