PLL on crank angle sensor input

[Steven Arnold]

I am in the process of designing an microcontroller ignition system, and
was wondering - 

how common is it to use a PLL on the crank angle sensor input?
does any one have a typical circuit design for this part of an efi
system?

Also,

Do Bosch, or someone similar have a catalogue of aftermarket efi
components, such as MAP sensors, hot wire air mass flow sensors, and
ignition drivers?


thanks

-- 
slarnold at postoffice.utas.edu.au
http://www.geocities.com/MotorCity/1309