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New Oil Pressure & Water Temperature Gauges don't work....?

iambler

New member
Hi Group,
I have a 2019 Mercury 90 HP 4 Stroke Outboard engine, that I have just installed a SECOND set of two gauges in, which still don't work, after a second try.???
These are connected to a Mercury Wiring Harness going directly to the engine.
When I turn the key on, the needle of the Water Temperature Gauge "bumps" or jumps a little [showing me that it IS receiving power] but neither gauge works?
The dash lights do work with these gauges, when turned on (?).
- These were wired/connected by my Marine Mechanic, so I assume he knew what he was doing.
WHY DON'T THESE GAUGES WORK?

--- I read when I purchased these gauges that each requires it's own Sender Unit, and one gauge uses a "C" Sender and one uses a "D" Sender.

--- I have no idea if my New-in-2019 Mercury O/B came with these Sender Units.

I wouldn't know where in the engine to look for these Senders anyway.

BTW - both are Sierra Amega Gauges.

Could anyone HELP ME with this dilemma!

Thanks!

Irv in Maine/iambler
 
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