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:beerme:what is the device under the dash that looks like a clock on my 1990 yj,not sure how to post pictures, the device is mounted to the firewall and you see its plastic gears. thanx!
 

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Clear plastic case?

That is the emissions timer. It's only job is to turn on the emissions maintenance light at around 75,000 miles. At which point you are supposed to replace the O2 sensor. It's non resettable and not user serviceable. Once it triggers it's done.

Rip it out and throw it away. That's what I did.
 

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Less parts goes faster better mileage yippee !!!!
 
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