[DeTomaso] Modifying The Pantera Tach For 6A Tach Signal Direct Input

[Thomas Tornblom]

Thanks Bill.

I bypassed R9 to get the tacho to work with the 12V tacho signal from  
the EDIS ignition I'm using, and my guess is that this will work also  
with the MSD.

Not sure if C1 should be removed as well, but it appears to work anyway.

Cheers,
Thomas


17 apr 2010 kl. 19.47 skrev SOBill at aol.com:

> Thomas,
>
> The Pantera tachometer could be modified to use the TACH signal  
> directly from 6A ignition box.
> This would eliminate the requirements for the less than totally  
> reliable tach adapters. The modification would require pulling the  
> tach from the car and changing the input circuit filter consisting  
> of R9, C1, R8, and C2 on the tachometer circuit board. I have not  
> determined, done, or tested the required modifications.
>
> I have posted the tachometer schematic at http://www.poca.com/gallery2/main.php?g2_itemId=18578 
> . This schematic can be printed directly by right clicking and Print  
> Picture. This print will be about 1/2 of a page in size. A full page  
> schematic can be had by right clicking and Save Picture As and then  
> printing the picture as stored on your computer.
>
> If you make and test the required modifications, let me know what  
> works and I will post an updated schematic.
>
> Have fun,
>
> SOBill Taylor
> sobill at aol.com
>
> In a message dated 4/16/2010 11:51:46 P.M. Pacific Daylight Time, Thomas.Tornblom at hax.se 
>  writes:
> SOBill at aol.com skrev:
> > EA,
> >
> >
> > Installation
> > The White wire of the  8920 must be connected to the Tach Signal  
> connection
> > on the 6A.  The Tach Signal connection on the 6A will have a 20%  
> duty cycle
> > 12v  square wave on it. One pulse for each spark  occurrence.
>
> This sounds like the tacho could be made to work by just bypassing the
> series resistor on the tacho signal.
>
> Didn't you have a schematic for the tacho?
>
> Cheers,
> Thomas
>
>
> !DSPAM:4bc9f459173441810116612!