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I would appreciate some expert advice on engine analyzers on 6v positive cars. There are many on the internet listed for 12v but not 6v.
The National Service Manual stipulates the idle for the 1937 Super Eight should be set to 350rpm or 7mph.
For years I have just been setting it by sound, the way my Father taught me. Am curious to 'go by the book'. The Shop Manual just says 1/2 turn out from closed.

Also, if someone can recommend a good make and model, it would be appreciated.

Thanks for looking....

the easiest way to test engine RPM accurately is with a photo tachometer. no connection required so voltage is irrelevant.
Here's one that's not expensive and would do anything you needed.
http://www.amazon.com/AGPtek%C2%AE-Professional-Digital-Tachometer-Contact/dp/B004Q8L894/ref=sr_1_1?ie=UTF8&qid=1440180177&sr=8-1&keywords=laser+photo+tachometer

Many thanks. I was unaware of this product. One review claims the accuracy is questionable, but worth a try.

Thanks.

I picked up an old Penske tach/dwell meter at a swap meet for $10 It just hooks up to ground and the coil- has high and low range RPM

I use one made by KAL.

It runs on 12 volts and I use a motorcycle battery.

All the measurements work fine on my 6 volt positive ground Packard.

Tach, dwell and other stuff including charging amps, volts

It6 was free.

Jim