Which flavor of 1JZ?
JZX81, JZA70 use a COR like GZ20 stock so that should be easy
JZZ30 and JZX90 use Fuel Pump ECUs. In that case you can use a tachometric relay (often used on gas conversions), or another option is to make a little circuit that takes the FPC pin from the ECU (that ussually goes to the fuel pump ecu) that triggers the COR...
See this thread
http://www.toymods.org.au/forums/showthread.php?t=58509
Cheers
Wilbo
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