[DeTomaso] Duraspark and Pantera Tachs

[SOBill at aol.com]

The Pantera OEM tach will run off the coil minus (-) terminal with  a 
Duraspark ll. No tach adapter is required.
 
The main Duraspark ignition module can be thought of as a  set of electronic 
breaker points.
 
 
With a Duraspark box, you need a ballast resistor. On early  Panteras, a 
ballast resistor which looks like a block of ceramic was used.   On late Panteras 
a resistance wire was used between the ignition switch and the  coil.
 
The Duraspark wiring diagram is attached.
 
The White wire to the Duraspark from the starter switch retards the  spark 
timing when you are starting the engine. The White wire should be  connected to 
the left small terminal of the starter solenoid .... the terminal  with the 
Red wire from the Start position of the Ignition Switch.
 
The Red wire to the Duraspark should be connected to the end of the  ballast 
resistor which is not connected to the ignition coil on early cars or to  Fuse 
#12 on later cars. Fuse #12 can be accessed via the passenger side rocker  
panel with the seatbelt anchor removed. This point is the 12V from the ignition  
switch in the Run and Start positions. Be sure that this wire has full 
battery  voltage when the ignition switch is in the run position.
 
The Orange wire on the right small terminal of the starter solenoid  is 
connected to the positive terminal of the ignition coil. This wire  bypasses the 
ballast resistor and thus provides full battery voltage to the coil  when you 
are staring the engine.
 
The Tach connection on the diagram is where you should connect the  
Blue/Black input wire for the Pantera tach. This is the Minus (-) terminal of  the 
ignition coil and is the point which gets switched by the Duraspark ll main  
module.
 
Be sure the main Duraspark module is bolted to a metal surface. The  surface 
provides a ground for the switching circuits and acts a heat sink to  keep the 
module cool.
 
Let me know if you have any questions or problems with this  installation.
 
Have fun,

 
SOBill  Taylor
sobill at aol.com

 
SOBill  Taylor
sobill at aol.com
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