[DeTomaso] Tach question

[SOBill at aol.com]

The OEM Pantera tach is voltage triggered.
 
The tach requires the 200 volt transients that occur at the coil  negative 
terminal when the points open. The various aftermarket ignition  manufacturers 
build tach adapters for voltage triggered tachs which accept a 12V  square wave 
from the ignition box and using a power transistor and a coil  generate the 
required 200 volt transient required by the Pantera  tach.
 
The Pantera tach contains the electronic circuitry required to  filter and 
detect the 200 volt pulses and convert them to standard  width pulses for 
driving the meter  movement.
 
Have fun,
 
SOBill  Taylor
sobill at aol.com  

 
In a message dated 7/11/2008 8:13:06 A.M. Pacific Daylight Time,  
rimov at charter.net writes:

Is the  factory tach voltage triggered ( attached to the negative terminal on 
the  coil) or current triggered (attached to the positive terminal of the  
coil)

Thanks

Paul  
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