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Matti,
The wire connecting/spliced to the ECU wiring loom are to the power wire and the accelerator pedal position sensor. Nothing else goes to the ECU.
As for the LED's. One is probably a power LED to indicate that the unit has power. The other maybe lights up when under heavy load like the DPChip.
I'd suggest that the unit is manufactured by someone else just like the DPChip is made by Kueberl Tuning Systems in West Germany.
Have a look at the link in the previous post.
Regards
D.T.
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LC Prado GXL-TD 95 Series. OME Suspension, ARB Steel Bullbar, Warn M8000 winch, Safari snorkel, K&N Air Filter, 3" Exhaust, DPChip, Homemade Roller Drawers, Rock Sliders.  & No self righteous attitude.
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