so im on marine engine and looking up a wiring harness for a merc 140 (1977) and there are 2 wiring harnesses listed. 1 P/N is 84-66962A 1 for 66.80 and the other is 84-86673A 2 for 210 bucks. on perfprotech it says one to use with fuse and the other doesnt specify anything. anyone know what the difference is? maybe i should contact marine engine and ask them?