I doubt that any reconnection would last very long but if you're creative then you may be able to do something.
I think they're just called a 'fuel gauge sender' or possibly 'sensor'. You do need to specify the year and engine as there are a number of variations.
You could look at
http://cgi.ebay.com/ebaymotors/Fuel-...mZ140265416416
eBay item #140265416416 but I don't know if it will fit your car. Search for 'volvo fuel gauge' without the quotes.