Analogue temperature gauge reading high

[mlines]

We have a Mercruiser 350 MAG. It has a standard dashboard analogue temperature gauge and also a Smartcraft digital system.

Everything is running just fine.

The Smartcraft digital is reporting the temperature as 68 to 71 degrees C during both low and high speed running which seems fine to me. The analogue gauge is reading just over 175 degrees F which seems higher than it was in previous years. Now 68 C is 154 F so its a definitely high reading on the analogue gauge.

Any ideas? Are they fed from different senders?

 

[spannerman]

Yes, one is an analogue sender the other digital.They will be mounted on or near the thermostat housing, the analogue will be a single wire the digital 2 or 3 wires. Check the connections on the analogue first or it could be the sender is on its way out.

 

[mlines]

Great, thanks for the reply

 

[Jim@sea]

Why dont you buy one of those hand held Temperature Sensors where you pull the trigger, and point at the engine, a beam of infra red light rests on what you have pointed at and gives you a temperature reading. Conformation at least.