[DeTomaso] Tach Problem

[bill gaino]

Dave, I too use the 8920, mine melted twice. The first was replaced. the second was sent back to msd and they fixed it. I run a 5 amp fuse to the 12 volt input and have blown hat fuse on occasion. It has been working for over a year now. I recommend the light fuse, and also be aware of the potential smoke or fire from a melting unit. Mine is mounted in the engine bay behind water bottles. Bill 1362
-----Original Message-----
>From: David & Marilyn Bell <davidabell at worldnet.att.net>
>Sent: Oct 26, 2009 1:08 AM
>To: "Detomaso at Realbig. Com" <detomaso at realbig.com>
>Subject: [DeTomaso] Tach Problem
>
>John Taphorn and I just picked up my Pantera after 2-1/2 years storage at my
>sisters house in Crawford,TX.  In spite of massive secret service protection
>the entire time the car was stored in Crawford, I've discovered that the
>tach has ceased to function (it was working last summer).  I checked the
>output from the tach adaptor and got a constant 12 volt signal, that does
>not vary with rpm.  I've also swapped in a substitute tach that doesn't work
>either.  The signal wire voltage at the tach itself is the same steady 12
>volts (the wire isn't broken along the way).
>
>I'm not sure that measuring voltage is the way to check the tach adaptor
>signal however.  Is there some way for an electron challenged person to
>figure out which electronic gizmo might be the problem?
>
>
>Dave Bell
>
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