'93 SAAB 900 wont start

Neutral safety may not start in park but it should in neutral if park circuit is bad.

Not sure if this applies to your 900 as it was on a 9000 forum. "Step 3?Check the main relay-
Ignition OFF
Pop connector off DI cassette? Connect a test lamp between pins 10 and 6 of the cable side of the connector.
Remove fuse 23 for 5 seconds (or more), then re-insert.
Ignition ON? The test lamp should light up for about 6 seconds and then go out.
Does it light up?
YES? Main relay is OK.
NO? Go to TEST 4(not Step 4) -Main relay check

Step 4? Crankshaft Position Sensor test.
From Step 3, Turn the key to START (from ON) to run the starter motor after the test lamp has gone out. It should light up again.
Does it light up?
YES? Crankshaft position sensor is OK.
NO? A problem with the Crankshaft sensor or connection to the control module."

BASIC NEUTRAL SWITCH IF BAD U WILL NOT HEAR ENGINE CRANKING JUST SILENCE BUT MAY START WITH GEAR SHIFTER IN NEUTRAL, NOTE MAY START, CRANKPOSITION SENSOR IF BAD U WILL HEAR ENGINE CRANKING BUT NO START, GOOD LUCK.