ignition module

[chetwagner at uswest.net]

Does anyone know much about the GM ignition modules that were 
used on about everything, like the Sy/Ty and the corvette?  If so, let 
me know because I need to know how it operates and at what 
voltages.  I am in the process of making an ignition module that will 
use a HALL effect sensor instead of a reluctor.  Any ideas would be 
helpful.
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