Re: Convert 6 cyl tacho for use with 4 cyl

[Ludis Langens <ludis@cruzers.com>]

Shawn Lin wrote:
> 
> In my '90 Grand Prix instrument cluster, the resistor is on the circuit
> board very close to the terminals that the electro-mechanical motor
> assembly plugs into.  The resistor is etched onto the back of a 14-pin
> DIP which is white in color.  I can't remember, but I think the 14-pin
> DIP has no function except as a surface for the resistor to be etched
> upon.

If the Grand Prix tach is like the other electronic GM tachs I've seen,
it uses the LM1819 chip.  The "white 14-pin DIP" contains most of the
resistors needed by that circuit.  The calibration resistor on the top
layer is just one of them.

-- 
Ludis Langens                               ludis (at) cruzers (dot) com
Mac, Fiero, & engine controller goodies:  http://www.cruzers.com/~ludis/


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