I bought a 115 HP, 96 Evinrude on EBAY. Have all the instruments and controls except the warning horn. My Throtle/shift control is the concealed type, with no warning horn. I have a 96 OMC service manual and no where can I find where, how or what horn to mount. There seem to be at least 1/2dozen model numbers. Question is, ARE THEY INTERCHANGEABLE or do I need a specific one and can it be mounted anywhere. ps. My wireing harness has a 2 pin connector for it.