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It won't hurt anything to run without an o2. There is a guy here in Atlanta who actually passed emissions without an o2 on his 20v. If you want to be cheap about it, just use a 1wire o2 and plug it into pin3 on the o2 plug. It still gives the code, but accepts the signal. This trick only works with blacktops.
The speed sensor is in the cluster on the mr2. A wire runs back to the ecu to give it the signal. It's the purple and white wire coming of that trunk connector.
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