Hi. I recently asked about fitting a lowrance fuel flow transducer to my 4.3mpi v6 but have now decided to get the mercruiser sc1000 tach/speed gauges. But I'm not sure of the correct set to get. My engine number is IA064661 and I have seen a set with these numbers 79-8M0063160 KT-TACH/SPD 80BLK...