No Signal To Temperature Gauge

[Chip S]

I replaced my 1993 Mercury 150 hp 2 stroke Black Max outboard with a 2023 Mercury 150 hp Four Stroke outboard. The speedometer, tachometer, and voltmeter are working fine, but the temperature gauge is not getting any signal. An 8 pin to 14 pin adapter was used. Any idea why the temperature gauge is not getting any signal?

 

[Chip S]

Update: Mercury monitors water pressure on the Four Stroke outboards using a tube similar to how a speedometer works. There is no electrical signal. This is why the temperature gauge in the dashboard wasn't working.

For the 2 stroke outboards, Mercury used a cylinder head temperature sender/gauge. My mechanic installed a cylinder head temperature sender on my Four Stroke outboard and attached it to the wire for my temperature gauge. The temperature gauge is now working fine.

 

[Scott215]

That's interesting thanks for posting