Peugeot 306 dashboard

[number-one]

306 hdi doesnt have oil temperature gauge, only oil level. 306 gti-6 have both (level + temperature) in the same needle. i?ve fited a 306 gti dashboard on my hdi, the temperature and level oil gauge its ok, but the rev needle is not correct and the distance to change oil is diferent . hdi is 19900, gti is 9900. I now that diferences are in 93c56 eprom. Someone now, how can i fix that?

Thank you.

[cdb]

use an eprom programmer
search for hex 26 AC = decimal 9900
pherhaps AC 26 (little or big endian)
change in hex 4D BC = decimal 19900
or BC 4D
and write to the eprom