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View Full Version : Can you retain Analog Gauges if you replace older Mercury Outboard with New 300R?



Rocco
11-14-2025, 11:22 AM
Can I keep my existing Auto Meter gauges if I switch to a new Mercury 300R Outboard?

Jim Speros
11-14-2025, 01:48 PM
There is an analog gauge harness that connects to junction box. I would suggest you definitely add a screen to take full advantage of what is available.

Here is my wiring layout for twins.
546372

It may be difficult to read but note N says if plugging analog harness into J box a Gender Blender is required.

Rocco
11-26-2025, 10:28 AM
Thank You!

25two.stroke
11-26-2025, 01:53 PM
v10 is not compatible with analogue gauges, v6/v8 is so yes. If nothing else get a sc1000 so you can view codes, hours, maintenance log etc.

LakeFever
11-26-2025, 08:27 PM
You can always add old school sending units to the motor. Super easy and low buck too