Z32 No start. No oil pressure.
 

Hey guys! I have a 90' 300zx that won't start. I was driving on the highway and my oil pressure went down to zero. The Z stumbled and stalled out. Now it won't start. I looked underneath and the oil pressure sending connector was disconnected. The Z still won't start after I connected the connector. I can hear the starter turn but no crank. I hear grinding noise near the shifter sometimes when I try to start. Please help me! Thank you guys! :)

bad sensor or failed oil pump