07-02-2014, 10:45 AM
There's a fair chance that if the shift light has the required filtering to allow it to work with the signal from the back of the coil that it potentially won't work with the tacho driver output on the HDi's ECU anyway.
1990 Peugeot 205 GTi 1.9 // 1991 Peugeot 205 GTi 1.9 16v // 1992 Peugeot 205 GTi 1.9 // 1999 Peugeot 306 HDi Estate