Caterpillar 3406B Diesel

 I need to replace the mechanical tach cable on my 1984 Peterbilt 362  Cabover. I have a cable that came with the truck. I see why the previous  owner didn't install it. The tach cables have different ends, round  with a tang pinched into it. This MDS adapter I bought from Summit  Racing and a little bit of filing down the square end of a much less  expensive speedometer cable might be a suitable fix when the original  style isn't available or is too expensive.