I had an Autometer tack on my '85 when I was racing it.  I tried the diode method and had bad luck.  The tach has a switch on it to select the number of cylinders, on my tach it just switched a different resistor into the R-C (resistor-capacitor) network. I removed the resistor on the 4 cyl. terminal and attached a decade resistance box and dialed in the resistance that made the tack respond correctly.  I soldered that value resistor to the switch terminals and everything worked fine.  I could pull apart the tach and get the value of the resistor (I have a good memory.. but it is very short!) but I'm sure that it would only work for that particular model tachometer.
 
Dave Galusha
VMOA #1177
-----Original Message-----
From: Tyler Pennock [mailto:[EMAIL PROTECTED]]
Sent: Monday, May 01, 2000 9:19 PM
To: V-MAX TECH LIST
Subject: Re: Autometer tach on my MAX

Pointing the diodes toward the coils will block the pulses from reaching the tach.
Tyler Pennock,VMOA # 380
Eastern-Canada Director
1987 Vmax 1260
Ottawa,ON,Canada
[EMAIL PROTECTED]


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