there is a gauge listed in the NAPA balkamp book that uses the standard gm oxygen sensor. i did look further....yet. regards, tim colson **************Hot Deals at Dell on Popular Laptops perfect for Back to School (http://pr.atwola.com/promoclk/100126575x1223105306x1201716871/aol?redir=http:%2F%2Faltfarm.mediaplex.com%2Fad%2Fck%2F12309%2D81939%2D1629%2D9)