From memory, yes, Pintara, its the CA20 Manual speedo gear drive. I think the one with the red gear on it. But they come in different colours which correspond to your diff ratio.
Personally, I would be definitely upgrading the speedo. It'll make life so much easier.
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Ongoing Project: 1972 Datsun 510 S13 SR20Det.
http://ozdat.com/forum/viewtopic.php?f=33&t=17898
New Daily: D22 Navara (The new workhorse)
Retired 12/2016: MY98 Subaru Impreza RX
Previous Car: Restored Green 1972 Datsun 510, Hot L18