Did the 3SGE motors ever use the Toyota VAST ignition systems that were applied to 4AGE's of the late 80's?
The VAST igniter dealt with both driving the coil and filtering the VR signals from the distributor. It filtered the tach signal into a simple 12V square wave signal which was sent to ECU. The VAST ignitor runs a standard 10 degrees of timing unless provided a 5V square wave signal on the IGT wire, which then gives it the advance amounts.

The VAST unit is so simple, you can run the car with the ECU removed and just spraying starter spray in the intake :)