Sierra International IH15105 Code B Tachometer Harness for Mercury/Mariner Outboard Engines Sierra IH15105 tachometer harness for mercury/mariner Outboard engines; Code B Before ordering, please verify this is the correct part for your application. For assistance, please call sierra's Tech support at 1-877-663-8396 All sierra Parts qualify for and are covered under sierra's industry leading customer satisfaction warranty