You can use a set of muffler clamps or stainless u bolts and hang it from the seat post. There should also be room along the transom, which is the standard mounting on newer models. The part under the splashwell lip, right behind the lids is another option. On a 90s model that in a channel that is in the splash well for wiring, and you can bolt through that board glassed under there through the top side. There you have some ideas! BCB