<VV> Erratic Tach with Crane/Allison Ignition

[Mikeamauro at aol.com]

I've installed a Spyder dash in the wife's Greenbrier. The van has an  
Allison/Crane XR700 ignition + a Safeguard. The tach is erratic: tach function  
seems OK sitting still and revving the engine, but on the road at speed, when  
mashing the gas, the RPMs increase, in an unsteady manner,  dramatically. 
Listening to the pitch of the engine, the RPMs, in actuality,  are not increasing to 
match what the tach is "saying." The Allison/Crane  instructions state buying 
and connecting their Tach Adapter might solve erratic  tach function. I've 
already placed a 10-ohm resister in series with the signal  wire between the coil 
and the tach (per Allison/Crane tech support advice),  but the problem 
persists. Has anyone else experienced erratic tach  operation when using the 
Allison/Crane ignition; and, if so what was the  fix? Before shelling out $$$, and 
taking the effort to hook up the Tach Adapter,  I'd prefer to hear form others 
who have already dealt with similar issues.  Thanks...
 
Mike Mauro

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