74 DT 360.       Hi. What holds bottom speedo cable into hub? Can’t really tell on Partilla.   Some  clip like tach cable?  Also would pay good $ for a tach cable from someone(just not quite $215 for the one on EBay) thanks 

Search is your friend. 

Here's a whole thread on the topic with Yamaha part number and alternative solution

yamaha-enduros.com/index.php/forums/main...r-cable-retainer#161

Happen to have mine on the bench. This is probably what you are looking for. And x2 on the tach cable, I can’t find one either!  
sorry, pics won’t attach. 

It's a circlip "But no as we know it Jim --was that startrek!!. Anyway. Speedo cable circlip is just a wire circle with stick up wire ears so you can just grab 'one' ear with thin nosey pliers & give it a bit of a turn & pull & you'll have it. Lost the last one i did & had to rummage through my junk to find another. Then found original stuck in my boot sole haha. Actualy i'm sure i put that up here years ago so i might be able search & find it as that way the pic might be able to be viewed. I'll go search old posts.

No luck looking for my years old post or pic. But here's one here for a look. Maybe best to grab bothe ears if you can rather the how i suggested above but whatever works for you.

hvccycle.net/yamaha-speedometer-cable-re...ake-102-25137-00-00/

Thanks for all the great responses guys as usual. I drive truck 10 hrs a day & my mind races all day as to what I’ll do to bike when I get home-then to tired to do anything .Including search forum Bad when your bikes 48 yrs but your 14 older than bike! Thanks (& of course there was no cable with the bike).

I wonder if a dt250a tach cable will work? The clocks on that bike a beaten to smithereens.. so it could be available.
Sneezles61