no spark HELP

hello all im working on a friends 91 rx7. im getting no spark at the ignition coil packs. where would i start to look for problems? i was thinking crank angle sensor. what are the requirments and sensors that need to be used in order for the engine to start up.
thanks a million

Definitely do some regrounding for (most importantly) the battery, ignition, MAP sensor, injectors, and ECU. Be sure to test your plugs if you havent already

no spark it seams like this is a non turbo harness and this is a turbo settup. what are the requirments of the ecu meaning what do i have to have connected for this to work. tks

problem fixed i found it to be no ground to ecu, fried ecu, fied crank angle sensor, fried traling and leading coils. got it running but keeps stalling. still working on the mazda pain!

still looking for an answer on required sensors? tks