Dwell meter question

[corvette8n]

Found a dwell meter from early '70's on my garage wall, it has only two connections on it red & black(I assume + and - ). My question is where do I hook this up to test with? My car is a '41 v8 with a remote coil kit, can style coil is mounted on fender. Only instruction on meter is to double the reading when testing a four cylinder. What kind of reading should I get on the dial?

[40cpe]

On a negative ground system the red goes to the distributor terminal ( - ) on the coil, black to ground. I'm not sure how positive ground would affect it. If it doesn't work, reverse the leads.

[tubman]

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I bought an old cheapo unit at a garage sale. On mine, if you hook up power to the unit and ground the right way, it works just fine. Seems to read correctly, too. I like it so well, I permanently mounted it on my engine test stand.