In a message dated 17/10/2007 00:35:23 GMT Daylight Time, bones@xxxxxxx writes: Having looked at the A variables listing you seem to have entered the wrong string. The list shows FUEL TOTAL QUANTITY not TOTAL FUEL QUANTITY. Syntax is rigid - you can't avoid it.. Try: %((A:FUEL TOTAL QUANTITY, gallons) (A:FUEL TOTAL CAPACITY, gallons) 100 / * )%!3.1f! bones Bones I am a moron! Thank you. My gauge now works perfectly with the expression - %((A:FUEL TOTAL QUANTITY, gallons) 100 * (A:FUEL TOTAL CAPACITY, gallons) / )%3.1f! which is the way I was trying to get it to work. I didn't try your expression as now I've fixed it I'll leave it alone! Thanks again Frank T.