Electronic variable vane control
Electronic variable vane control
The cost and time of that would be better invested in an actual EGT monitoring/logging system.
The glowplug's arbitrary voltage generation shouldn't be used for anything but personal amusement or satisfying curiosity. Using them to tune the engine is a very bad idea since glowplugs are not sensors, they are heaters and subject to manufacturing tolerances (even in the same batch) that can cause misleading measurements.
Here are some examples of what to look for:
http://www.jegs.com/p/Altronics/758148/10002/-1
http://www.aircraftspruce.com/catalog/in...canner.php
http://www.aircraftspruce.com/catalog/in...ombos6.php
The last one is only $281 for a complete kit with probes that can read EGTs for up to 6 cylinders.