Re: SW 990B tach and 970 transmitter?
I am not sure, but the transmitter probably conditions the pulses coming from the distributor, and integrates them. Basically the # of pulses for a period of time represent a voltage, more pulses the higher the corresponding voltage is. The meter movement is a voltmeter calibrated to convert voltage to a corresponding RPM's.
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Steve Shauger
The Supercar Registry
www.yenko.net
Vintage Certification™ , Providing Recognition to Unrestored Muscle Cars. Website:
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