[snah]

I think the original plug can break down from age and there is this optimized plug connector that replaces it. When ordering the Pulse Sender it also specifies to order the plug parts as pictured.
This morning I got a copy of the workshop manual explaining the procedure. I realize now I needed 3 of the connectors and 3 of the little gaskets. That makes sense as it suggests to cut all three wires next to the old connector housing. I only ordered one of each. Duh!