V-8 to V-6 Tack conversion

[peter paul fenske]

Hi Bruce and all 

The tach GM uses is a LM1819 driven air core meter
The national special devices book shows the schematic.
There is a resistor pack which is different for v6 or v8 apps
Just change the resistor for what you guys need.
Also handy info if you ever have to fix tach

l8tr:peter


At 01:39 PM 11/30/97 -0800, you wrote:
>At one time I thought I had seen (in print somewhere) of a simple R/C
>circuit for doing this (may have been V-6 to V-8).  Just wondering if
>someone here has done this.
>  While more complicated, would using a programable divide by 10 device
>set to count to four, and reset, but just use three pulses to the tach?.
>ER, use the three pulses to trigger a 4066, and run like a MOSFET off
>that.  I'm skill limited in circuit design, and execution, or would a
>optoisolator be better?.
>  The reason I ask is that I'm going to a V-6 MPFI, from my V-8, and
>would perfer not to but a new tack, and just use the original one.
>  TIA  Bruce
>
>