Amazing how stiff the original injector wires were.
Baked on a hot engine for 20 years (207,208 miles).
The insulation was rock solid and not keen to be stripped off.
As said earlier, the wires were:-
twisted together,
pushed into a bullet crimp connector, and
crimped tight into place.
Sleeved with heat shrink tubing.
Finally they were bound in cheap and tacky pvc tape.
It was stiff, brittle and not very sticky.
But hopefully will improve with engine heat.

The engine still takes a while of cranking to fire up, but after about 15 seconds of lumpy idling, a quick blip of the gas, and the car idles and revs smoothly.
Maybe it needs to build up fuel pressure or compressions.
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Another job that had bugged me for a while was the front fog lights.
The Vectra uses CANbus technology normally, but my engine bay module (UEC) doesn't support front fog lights.
I had used the old-skool relay method many years ago to retro fit the fogs.
Moving on to about 16 months ago, I sent the car away for dual mass flywheel and clutch replacement.
When the car came back, the foglight feed wire in the engine bay had been cut or snapped, and badly joined by one of those plastic coated crimps.
Obviously this joint failed almost immediately.
As I was in the engine bay, I sourced a new wire, crimped and sleeved into place.
Eh voila, front fogs now work again.

To a fashion - the left fog bulb was dead.
So another job for another day.