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Operating an OMC outboard with a Morse MT-2 or 3 control requires both a set of universal end control cables, (on both ends), and a special OMC adaptor kit for the engine end. Since the boat is 1974, I am assuming the engine is also.

Only buy the new Dometic XTREME cables, the smoothest made. Such as here:

https://www.dometic.com/en-us/outdoor...633-244852

for the engine end fittings, see here:

https://www.ebay.com/itm/390664539726...gIbS_D_BwE

You may be able to remove the end fittings from your old cables and install them on the new cable?

You may be able to shop around and find better pricing than indicated here. But I assure you, these are the items you need. if you engine is a different year, you can search out the correct end fittings