If I understand your question correctly, you want to know how to overclock your Geforce2 and you are using Detonator version 6.67, correct?
There are a few ways to go about it. You could edit your registry and add the right keys and values to enable this in the display control panel.
Alternatively you could download a registry file and merge it into your registry that would do this for you. There are also some other programs out there that supply this feature. I use PowerStrip because I like to tweak my monitor as well.
You want to find things like Nvmax and Nvtweak to name a couple. Try not to kill your system, registry editing can be dangerous and all that CYA stuff I should be saying here...

Go here for lots of files and info:
http://www.tweak3d.net/