Well unfortunalty I have benn there done that already too. i was getting a faulty reading (very high). there is a good tech paper on it on the raymarine site, just do a search. Its a simple ohm value per tempreture.
There are 2 fixes, replace the trandsducerr/thermistor, or you can add a second smaller thermister into the hull and splice into the harness. I opted to replace the existing transducer. The biggest issue for 318 owners, is the placement of it in relation to the starboard engine. I had mine done when the engine was out for my generator nightmare, so it was an easy swap. NOt the case with the engine in.
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Jeff
'14 Cruisers 380 Express "Simon Sez"
Merc 8.2 Mag MPI 380
DTS B3X, (x2) Axius Premier
(SOLD)
'08 V318
Merc 350 Mag MPI 300
DTS Seacore, B3 (x2)
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