It will be much better if people without proper knowledge would not write misleading information on the net
I understand you wanted to help Juliansr but you do not know what you are talking about.
All IMMO3 clusters are CAN based (so has ABC 920 (8|9)(0|2|4)(5|6|7|8)Y part number).
MFA aka half FIS should be 1J(0|5) 920 (8|9)2(5|6|7|8)Y where first 0 or 5 determines if it is standard or Sport Edition cluster, 8 or 9 determines if it is scaled in kilometers or miles, and 5, 6, 7 and 8 determines if it is IMMO2, IMMO3, petrol, diesel or some special (like Passat W8) cluster.
His cluster's part number should end with 826Y or 926Y (Y being a letter) and if it is not the case (for example it ends with 5Y - it would mean it is IMMO2 cluster which will not work). If it is/was Passat cluster (or a hybrid cluster made of different parts) it will work as long as it was not W8 one, and it is programmed with proper dump.
EDIT: And he will not be able to use RB8 dump in VDO cluster!!!