[DeTomaso] Tachometer challenge

[SOBill at aol.com]

To be certain, I need to know exactly what is controlling  the ignition in 
your system, but the most likely answer is "Yes, you  need an adapter for 
the OEM tach."
 
The OEM tach is designed to be triggered by the approximately 200  volt 
peak spike that occurs on the negative terminal of a breaker points/coil  type 
ignition system when the spark is generated. 
 
Most Ignition boxes or computer controlled ignitions put out a 20%  duty 
cycle 12 volt tach signal with each power stroke. An adapter (available  from 
MSD, et al) is required for the ignition box or computer controlled  
ignition to trigger the OEM tach from the 12 volt signal.
 
It is also possible to modify the internals of the OEM tach circuit  to 
accept the 12 volt trigger signal.
 
Have fun  today,

sobill at aol.com  

 
In a message dated 4/19/2011 11:36:06 A.M. Pacific Daylight Time,  
joernco at online.no writes:

Need  advice guys!

After i switched too Pectel SQ6 engine management  system
(http://www.cosworth.com/default.aspx?id=1090263)

we can`t  get the tachometer to work.  Do I need a converter or something
like  when I installed the MSD  distributor?

Anybody?



J.C.

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