Left hand tingling and wrist pain. do i use a wrist splint on it?

Yes: Yes you can wear the splint , but you have to see your physician to find the cause your symptoms, if no injury, most likely you may have carpal tunnel syndrome.

Determine cause: While many of your friends may be quick to diagnose this as carpal tunnel, you should seek evaluation to determine if this needs testing prior to splinting.

Possibly: You can start there but it would be better to get a firm diagnosis and then you won't mistreat and waist your time.