Quote Originally Posted by DMCMW Dave View Post
The Lambda relay is marked with an X because in the older all-metal update kits all the relays looked the same, and this one is signficantly electrically different. If you put a common relay in that socket, the freqency valve will not run. If you put the "x" relay in most any of the other common-relay sockets, it will cause most of the grounds to melt in the relay compartment.

Hence the sign DO NOT INTERCHANGE MODULES.

This sounds like a good relay for me to remove since I have ditched Kjet. Someday I am going to clean up in there and will label everything. But first I need to label the jumper pins on the RPM relay and tape a paperclip or jumper wire to it.

Oh, btw, I think Bitsyncmaster has a digital version of it, Hervey has an updated version but I don't think it is digital, and I would bet DMCH has an updated version as well. Dave is the man to buy from if you go with a DMCH part.