What is the accuracy of the average EGT gauge? Is it plus-or-minus 50
degrees or so? Is it possible to have them calibrated? If so, is it
worth it to have it done periodically? It seems that alot is at stake
if the gauges are not acurate.

My PA-28R-201T POH says that temperatures of 1650 degrees are
"allowable." My EGT's never get above 1420 even at the absolute peak.
Does that mean I am "golden" as far as temperatures go?

-Sami
N2057M, Piper Turbo Arrow III