Done. 21 terminals removed from the housing and 19 opened up okay. 2 broke at the weak point between the crimped end and the body. I think drilling holes in the remainder of the tag and soldering the new cables will suffice but if I change my mind later I’ll find another few to sort out.
Right, the strip method was as follows.
First use a jewellers screwdriver to open the end crimp from the plastic cable cover and bend the tabs flap.
Second, gripping the middle crimp in your hand pull the wire out or until it breaks off flush with the bottom of the crimp.
Third put a steel plate in the vice and close it with the terminals flattened tabs trapped up to the still crimped section with this resting on top of the vice.
Fourth step, get a thin nail and a ball pein hammer and start at a slight angle against the terminal to make sure it pushes against the plate in the vice to ensure the terminal doesn’t bend and keep tapping until the nail bottoms out.
Finally, remove from the vice and check all the old wire is out. The flattened end will need to be bent back before it’ll crimp again. I suspect I’ll strip more wire than needed and solder them in place to be sure it’s good.
I’m also planning on using a single multiplug to avoid disturbing these connectors again when the gauge cluster has to come out in future.