how do i make or get tech brushes for photoshop????

Have you checked out the big book of resources?
Or go on google. find some and turn it into a brush by greyscaling it and then edit- >Define Brush.

ok i downloaded a few brushes.... where do i save it to... i saved it in the brush folder of Photoshop. but the brushes dont appear.. what do i do?

you clik on the paintbrush tool.




see where it says brush, click on the drop down menu and then clik on the arrow in the circle thinger and select load brushes.




Select your brush you want to use and apply it to your artwork. Hope that helps