Thanks to the advice of board members I fixed my tach using a derivative of the "Foam Peanut" method. In my case I wadded up 4 or 5 rubber bands and used a 1/8 " rubber o ring of the correct diameter. Works Sweeeet!! Now to see how long it lasts.

Thanks for a great site!!!!

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85 300D 305K miles WVO(105K so far), Mine
82 300SD 235K miles BIO-D, Wifes
96 F250 SC PSD 4X4 285K MILES BIO-D, Ours
89 BRONCO 182K MILES sold
Finally Compression Ignition Only!

so I ordered a new one from Parts Shop, I tried all the fix-its...

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2000 Ford 7.3 Powerstroke 4x4
2006 Mazda Tribute
1983 Black 300 D (donated to charity)
1993 Teal 300 D (160K) Sold
"I love the smell of burnt diesel fuel in the morning, it smells like ....VICTORY"

Semper Fidelis
USMC 1973-1976

I loked at a replacement part. $80 if I was looking at the right part. If it starts acting up again I'll replace it.

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85 300D 305K miles WVO(105K so far), Mine
82 300SD 235K miles BIO-D, Wifes
96 F250 SC PSD 4X4 285K MILES BIO-D, Ours
89 BRONCO 182K MILES sold
Finally Compression Ignition Only!

mine is temporarily fixed with a cigarette butt. my dad fixed his by taking it apartl,scraping the silicone off the circuit board and he found that a little wire had pulled out of the circuit board and was not connecting(foam peanut pushes down on the board thus connecting the wire) he fixed this by soldering it. almost all of the circuit boards were flow soldered. meaning if the wire was big enough that it wouldnt get hot enough you get whats called a cold solder joint and you have to go back and resolder it. this is the same thing that often happerns on the cc amp circuit board.
i will soon try to solder mine but for now the butt works.

I hassled with my sender on my SD for months it would work for a few weeks and then go crazy again .It was fluxuating so much one time I was afarid that the tach would be damaged.I got a new one from FastLane ,just like having a new pair of shoes............

William Rogers.......