How tight a budget are you on?? Aftermarket ECUs come up secondhand occasionally for cheap, so you may be able to snag something with a loom... Also you may be able to get an OEM setup from ebay for cheap (somebody thinking it will sell well and find out only one person wants it and they wont pay more than $50).
Other than that, the port designs of the 1S and 3S-FE are significantly different, so you would need a custom set of manifolds.
Cheers, Owen
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