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Simple tests to localize a 911 3.2 no-start problem:

1. Remove the coil wire from the distributor cap and place the end about 10mm
from the engine case.

2. Remove the #1 injector connector and insert a noid light, buy one at
AutoZone/Reillys or Pep Boys.

3. Have someone crank the engine while you monitor both the coil wire & noid light.

Tests results:

A. Both immediate spark and noid upon cranking then;
Both speed & ref sensors, powers/grounds O.K., and DME ECM O.K. - Check for fuel
pressure and/or spray carb cleaner into air filter and re-do steps 1-3 above.
Check distributor cap next. The temp sensor can be bypassed by jumping the
temp connector (white) with a paper clip, which simulates a warm engine.

B. If neither noid nor spark then; check sensors (1k ohms, speed > 1.0VAC,
ref >.10VAC), DME ECM powers (1/18/35) & grds (5/16/17), or DME relay

C. If noid but no spark then; DME ECM a problem, or power to coil from ignition
switch (if already replaced the coil), also check coil wire for resistance.
Once it starts, remove the ref sensor connector, the engine should keep running
and accel perfectly (If not, then a bad speed sensor). Next, try reversing the
speed & ref sensors on the engine and then the two connectors on top,
i.e. To check for a possible weak sensor.

D. If spark but no noid then; power connection to injectors & ECM (pins 14/15) or
bad DME Relay.

Note: The temp sensor, AFM, and altitude sensor affect the fuel and are essentially
eliminated as problem sources for basic starting by using carb cleaner (A above).

The above is a starting point and NOT an exhaustive/in-detail troubleshooting guide.