I replaced the ST-30 speed transducer on my 2000 H340 a few years ago. I found it virtually impossible to route the wires from the new transducer up to the sea hood display without dismantling much of the boat. The Hunter factory left a few empty wire chase conduits on the boat with wire-pull lines in place. Nonetheless, getting the wires, undamaged, to and through these wire chase conduits was still a major operation even with the use of an electrician’s fish wire. Instead, I chose to splice the new transducer leads into the original wires from the old transducer and the speed data to the display seems to function normally.