check engine light on; seems to have trouble getting gas on 1995 Nissan Maxima

car wa leaking oil & waater, replaced lower oil pan gasket and systems service pipe. After repairs were done engine light came on and car was running rough.
tried to get diganosis and approx cost, but have been told that they cannot check easily as meters are only good for cars after 1996. IS their an easy fix or do I need to get a complete dianostic.

Asked by for the 1995 Nissan Maxima
You definitely need a diagnosis before you can know what needs fixing. A good shop should be able to read out what codes are in the engine module, but first double check everything you touched when replacing the pan gasket. There may be a connector that was left disconnected.