i have a 1087 nissan 200sx se with a VG30E and a 5 speed manual transmission.
the tach started to jump around a little bit today and now it doesnt work. also it idles really low and if i dont have my heater on it dies. i could really use some help please this is my first nissan and i love it but i just need some help with it.

Welcome to NICO, first step, check the ecu for codes. The dieing without the heater is likely an iacv or ficv issue, look at the both take them apart clean then and see fi it improves.