[CA] [CA11] ST 60 Tridata Speed Indication INOP

[MissHan]

My RayData M78879 display installed in our 1999 Searay 310 Sundancer failed last year, and unable to find an exact replacement, I replaced the failed instrument with an ST60 Tridata Instrument. The depth indication seems accurate but the ST60 will not display speed.

The parts manual for our boat indicates the following transducers are installed:

933853 TRANSDUCER, DEPTH RETRACTABLE VALOX RAYDATA
933861 TRANSDUCER, SPEED SELF SEALING VALOX RAYDATA

Do I also need to replace the depth and speed transducers for proper operation of the ST60? The ST60 Operator Manual specifies an M78712 speed transducer and either a M78713 or M78718 depth transducer for a fiberglass hull.

If so, are the new transducers compatible with the existing thru-hull fittings, or will those need to be replaced also?

Thanks!