Speedometer quit S70 T5 1998

[MoVolvos]

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Not suggesting a DIY but it's done frequently. On my second, the first was a 98 S70 T5.
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viewtopic.php?p=619939&hilit=4mm+socket ... op#p619939
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viewtopic.php?f=1&t=12651
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https://midwest-abs.com/
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DIY is pretty straightforward - not sure what you’re talking about. Did this job on mine in about a half hour.

It’s almost guaranteed to be the module. Get a new one from Midwest ABS and you’ll be set for the rest of the life of the car

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Can't suggested to the OP as I don't the their skill level therein all the options linked. Not difficult for us after a few.
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[abscate]

Easy if you’ve got the tools but I don’t open these any more, I just go to Matty

That lets my Time go to things I do well

If bread is tight pick up the phone and get on Mattys list for a blemished one to save some dough

[Chuck W]

I'm acquainted with the OP, and the exchange through Midwest ABS is going to be the best option for them.