The support for the 1.7 DME is real close to, "You're on your own". They were basically a sealed unit and the way it was intended was: Bosch would show at the races with the box needed to read them and all the programming changes would be supplied back by Bosch.
962-170 that I have referred to earlier is also a Trust car and when the DME on it was examined they found "
an unknown ROM" in it which has lead me to believe that Trust had someone, probably on their team, who was making custom chips for them.
Bosch owned the reader/analyzer that was used with these DMEs and it seems that they are close to truly unobtainium. As far as I have been able to locate there is one of the Bosch tools in the US (Florida) and if I remember correctly it is on loan there. I did a number of internet searches for any information on the readers and I came up with zilch.
I recently priced out a replacement 1.7 DME and the price in euros worked out to $45K to $50K.
Because of the expense of these cars and these computers combined with the rarity of them you aren't going to see someone reverse engineering these things. To ease tuning of these cars it was actually suggested to me by a reputable OC Porsche shop, to gut the 1.7 DME and put a Motec unit inside it.
Adapting a Motec (
without the camouflaging DME case) is likely the best choice for the missing unit in Wayne's 962GTi-106b. It would be easy to support but it would fail the original look test. Not even sure if the car would have had the 1.7 or 1.2 DME in it at the time when it was last ran. It will be interesting to see how he proceeds.