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a two-wire temperature gauge at front?
I never personally found one of those on my engines. Are you sure you are looking at the right spot? Or maybe the EU cars are different? esp the newer ones? (did you notice that I called a 1995 new?
our volvos here are from the 80s...)
I think it is more possible that what you are seeing is this: that section of the wiring harness has two wires in it and it is running that way,
towards that temp sensor, and it does hold two wires,
but only one for the temp sensor and the other one for energizing the glowplugs. Im not sure. a picture would be good help.