car turns over but won't start

What is your question?

i have tester light and my spark plugs are not getting any spark. no light. I have replaced coil in front of distributor and the spark plug cables are new too. I tested output from coil to distributor with tester light, no light. I tested both leads to the input to the coil, white with green wire shows light when I turn the ignition on. No light when I test all green wire lead. Not sure where to go to now. I have been reading and watching youtube... I have already ordered a new distributor cap and rotor. the parts on there now are the original. what about the crankshaft position sensor? Is this the next piece to replace? where is it? Can I test the old one?

How long has your 1991 Nissan Maxima had this problem?

5 months