Thread: SW Tach "wandering needle"
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Old 06-09-2009, 05:33 AM
Bobcat Bobcat is offline
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Cobra Make, Engine: # 757 ERA 427 SC , 482 Al. big block
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You didn`t say whether you are using an MSD system or not , but I ended up having to use MSD`s tach adapter to get my SW tach to read correctly consistently . The other thing you might check if you are using and MSD system is your wire routing . The tach signal wires must run away from the power wires . I believe ERA shows the routing in their manual .

Bob
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