http://www.dieselvw.com/EGTGauge.htm
WELLLLLLLLLLLLLLI only have a DP as the exhaust so i ONCE saw 600F but as soon as i backed off the pedal the dial went back to rest.But you can trick the gauge (when i had it out) into thinking the temp was super hot and the warning light is super bright.its my brightest gauge by far and the coolest looking. well... the oil temp gauge totally disappears when the light turns off...i duno I'll know how well it really works when i get an exhaust pipe on the car but im thinking 1,000F is going to be the hottest for what im running.I'll post some vids of all sorts of stuff when i insure it.ps. pride my self on those drillz skillz! you shoulda seen my block! drilled those steam holes like demz were ma bizatches