68 barracuda 120 speedometer

RedFish said
That is the 67 only inst' housing, so some might question speedometer application. 68 and later have the clipped on cable design while 67 has threaded collector. Pic of backside of speedometer to verify?

Here is a a pic of the back of speedo (screw on). I can tell you My 68 Barracuda 383s built in march of 68 has screw on speedo. Maybe early 68's where still screw on?