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NIStune Type 1 Hardware Installation Page 31 of 31
1986-1988 HR31 RB20DET
Note the later year models (such as MEC-R70 do not require this modification)
1. Locate opamp daughter board
2. On reverse side of ECU count from the outside edge inwards and bridge pins 7 and 8 with solder.
3. Connect a 5.1 volt zener diode with stripe side on pin 8 and other end on pin 6 (ground) as pictured below
4. Rewire the AFM as per pinouts in the AFM section of the Nistune Software Users Manual