The tachometer is intermittant on my 83 300TD I think it is a loose electrical connection to the sensor. Is the pickup for the tach located at the rear of the transmission ? I found a single wire connection with a rubber boot over it located at the back of the transmission on the driver side. Since the tach works sometimes and then suddenly drops to 0 and then will suddenly start to work agin Im pretty sure its a loose connection. Also when I had the Transmission fluid changed the mechanic said he fixed my tach for me. It stayed functional for about a month. Thanks in advance for any information......Russ Hummel

If you do a search on the subject, you'll probably find the answers to your questions.

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2001 Dodge Ram 2500 Cummins Turbo Diesel - 4x4, auto, 3.54 gears, long bed
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'92 300D 2.5 Turbodiesel - sold
'83 300D Turbodiesel - 4 speed manual/2.88 diff - sold
'87 300D Turbodiesel - sold
'82 300D Turbodiesel - sold

Your tachometer problems are most likely the relay. It is located on the drivers side fender wall towards the front. It is a black, cylindrical component about 2" tall. If you search this site you will find out about the cigarette butt trick or you can just replace the relay. I did the cigarette trick and it cured the problem but I am told it only works temporarily.

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1982 300D Turbo "Helga"
380,000 miles

Yeah, the old cigarette butt trick. Worked for me for a while, but for now I just do without my tach. I'd bet your problem is the relay and you can probably buy a new one from PartsShop.

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Dave
1995 C280
1999 Triumph Daytona 955I - my speed fix.
1982 300TD - Gone, but not forgotten.