None taken...probably could / should have been clearer from the beginning.

Although my tech is a factory certified guy and has been servicing forklifts for many years - the propane system sort of seems like a little "voodoo magic" to him and since I don't have any experience with it, I don't know what I don't know. He doesn't seem to have a real tight grasp on troubleshooting that system when it comes right down to it. I've been down this path before and a few $K lighter in my pocket. I am attempting to make this less costly and end up in a better place. My plan is to tell him exactly what I want done - then let him complete the work.

So this combo is compatible with the mixer that is on the engine now?

It is HD-5 according to my contract - whether that's what I'm getting might be another story.

Thanks again for everyone's input...