Tachometer for 59AB engine

[tubman]

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Since you're not looing for anything permanent, how about something like this : https://www.ebay.com/itm/31781209284...3ABFBMkIfQzZZn. I know it's for a single cylinder engine, but since each cylinder fires once per (one or two) revolution(s), it should work for any number of cylinders. There are many types available. At the price, it might be worth a try.