my EGT is in the same exact location. No other place made sense!
ashtray mount was easy. key switched 12vdc power was available also from the cig lighter...just splice into the grey light going to your radio and theres your light for them too...

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1992 300TE 4matic - Just obtained 12/22/06
1983 300D - SOLD
1997 Dodge 2500 - CTD 400+HP, 1100ft/lbs torque