I just bought a set of guages that came off of a 72 CL350 to put on my 76 550. Bought on ebay for 35 bucks after shipping, and they're in pretty good shape. They have a Nuetral light and a Signal light in the tachometer face, one of which could be used for oil I'm sure, just connect a different wire. I haven't mounted them yet because they mount differently than my stock 550 guages, so I'll have to get a mounting bracket off a 350 as well. I got the idea after meeting some guys with 350's at a vintage bike night and noticed that they're gauges looked exactly like mine and would be a much cheaper alternative to brand new "mini guages."