While we wait for someone with a GTF Instrument Cluster who's willing to extract the special firmware... @Jakka - these are the "decoded" IDs that a Mk1 Cluster handles (reading the V850 document, the hardware register that deals with these is shifted 2 bits, and to be efficient, the programmers left the data that way - so you need to divide by 4 to work out the values):
1D7 does not appear there - I reckon it's a bogus signal when the chip is first configured, especially because it's only 7 bytes, and these things are configured to always generate 8 byte messages. Sorry mate.