http://resources.kohler.com/power/ko..._690_01_EN.pdf
Sorry I forgot this last time, went to Gil's and our 8x8 Frontier with the 23 the MIL light doesn't light either, perhaps because there is no self diagnostic feature of the Comand efi's like the Aegis engines. Again I personally have no complaints with what we have out there so I never looked into it.
Your cluster is adjustable to remove the temp function icon from it like all previous air cooled engines. Understand the cluster fits all models so there are functions not applicable to all models included in it.