i swap out my temp sender from my 88 190e and when i pull out the old sensor on the 300e(which was new from previous owner) i found sensor treads covered with a lot of silicoln. no wonder my temp was wierd. temp is more normal now. it's true that the temp does move more than most cars. i like this type of gauge better. its faster,more accurate . thanks for the info,won't worry so much sitting at a light
thanks rich

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88 300E White, sold 9-04
88 190E Black 2.3 sold
90 300CE White, Grey sold 12-24-04
92 400E White,Grey Sold 5-06
90 300CE 91K Signal Red,Black Sold 2007
1989 300CE Smoke silver,Tan Sold 1-08
1993 300E 3.2 M104 motor
1991 300CE White,Grey
1994 E420 beautiful car,gone to new home
1994 E320 Smoke an Parchment.Beautiful car