Swaping from OBDII to OBDI

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Hi all, I've been pouring over the FSM's for the 97 and 92 SVX's lately, in an effort to revert my 97 to OBDI when I do my 6-speed swap. My main goals are to not have a false check engine light for the TCU, and to possibly install a chip in the future. It seems like just about everything matches up between the ECUs, except for the "induction control solenoid valve". I know this controls the IRIS valve, here's the issue: the 97 manual says when the ECU commands ON, it receives 12V, and OFF 0V; the 92 manual says when commanded ON 0V, and OFF 12V. Does anyone know if they used 2 different solenoid valves between the OBDI & II, or if it is as simple as switching the vacuum hose connections at the solenoid? I think putting a relay between the solenoid and ECU to invert the signal to the solenoid would work, I would just like to know if there is a difference. If someone has a better way of keeping the CEL off from a false TCU code, I would be open to that as well. Thanks in advance!