If you are looking for a late model tach for a 240 with the very matt surface their maybe one for sale on ebay. Without seeing a picture of the back of the tach I can't say for sure that it has the matt surface but the circuit-board is white. The circuit board on the early model is brown.
Just thought I'd pass it along, their not easy to find.
RonJ
http://cgi.ebay.com/ebaymotors/Volvo-240-Factory-Tachometer-Kit-w-clock-OEM-86-93-/120626823347?pt=Motors_Car_Truck_Parts_Accessories&hash=item1c15eb40b3#ht_1706wt_1167
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