2003 Mazda Protege DX Questions.

Howzit everyone, i just got a 2003 mazda Protege dx, 5-speed, 4door, and i was wondering if the headlight, tail light and other things such as intakes and exhust systems are the same as the Protege 5's. I was also wonderin if i could install an RPM gauge because it does not have one. will any universal one work with the car? thank you for all your help, i really appreciate it. Thank you!!

MSD Ignitions make what they call an RPM activated switch. I've used these to install moster tachs. into late model cars not equiped with them.