sounds like you've got a plug gauge for american vehicles with high energy ignition systems. i know craftsman makes 2 types, a standard(has gaps from around .018-045 or so), and a high energy type that has much larger gaps. i've got both, only a couple bucks each.

a feeler gauge will work fine, though, i like a wire gauge personally.

'79 sport 4x4 longbed <img src="/forums/images/graemlins/smile.gif" alt="" />
20/22R hybrid with EB's OS valves, 268c cam, offy intake, weber 32/36, thorley header, 5 speed swap, 34" LTBs, downey 3" springs, marlin hysteer, 4.88s and locked

'91 4x4 shortbed
22R-E, W56, the dd!