SRSG options

[guido28-at-xxxxxxxxxxxx (by way of Terry Fritz <twftesla-at-xxxxxxxxxx>)]

I was talking to a friend of mine before i started milling flats in my
motor, and he mentioned another option that may or not work. Actually i
know it will work, i just don't know if it will operate properly under
these conditions.  He was talking about using a dc motor to spin the
disk with 4 electrodes.  On one end of the shaft there will be the disk
with the electrodes, on the other there will be another disc, smaller,
and it will trigger a proximity switch.  If you can reference from the
AC line coming in, you can make a circuit to make the dc motor run in
sync with the AC phase.  Also we talked about the possibility of making
a control board which will let you see if it is in phase and also let
your retard or increase the timing, instead of doing it manually by
actually moving the motor.  I think this will be an excellent
alternative because you can control everything from a pannel and not
even have to shut down the system to adjust the phase of your srsg.  The
only problem i can see is the strong emf that is created by the coil. 
Since my gap will be in a cabinet under the coil, i was wondering if the
actual running of the coil will wreak havok with any parts on the
control unit.  It is possible to have all control circutis outside of
the cabinet except for the proximity sensor, which i think will take the
most abuse if any of the components are going to be affected by the
emf.  So pretty much my question is,  will a control board hold up so
near to a coil, or will i have to isolate all of the circuits and use
fiberoptics to reference where the disk is and how fast it is spinning? 
I can get all the parts no problem, probobally even for free, but if the
fiber optics are needed, it will get a bit pricey.......
Let me know what you think of the idea, even if you are not even sure
about the effects!
Thanks a lot!!
Brad DiGiovine