A new forum member

I am having problems with my 300D Tach. It is intermittent. Acts like a ground but I don't know. Tach reads fine at times then 0 at times no rhyme or reason to when it decides to read.

Recent work done at independent repair shop. Trip odometer repaired plastic gear was broken also replaced bulbs and rheostat in gauge cluster. Same trip in had new A/C compressor put in as old one was shot also put in new A/C control unit as temperature control was broken and would not turn.

Tach problem started after this work was done..... Any pointers to look at would be much appreciated. Checked tonight and my car is not eligible for the cigarette butt trick. Amplifier is a plug in to read diagnostics.

Thanks....

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Florida 1984 300D & 2002 C320 Sport Wagon