tips for a guitarist playing the bass?

Also, there's nothing wrong with a healthy amount of clack! It sounds great when done well! But with most things, be careful.

Clack kills ;) haha!
 
Just play root notes (with very sparse other notes inserted). Play slow and let the bass tone develop. Bass doesn't need to be fast.

Most importantly: buy a LONG belt and practice playing the bass in front of your knees/shin. Everything else is gay shit.