I have a pa-30 with IO-320 B1A's and the lyc part number for the gage is 74523. i have owned several 300/400 series cessnas and the left and right gages were calibrated differently due to the canting of the engine mount to be parrallel to the wing. It seems the pa-30 should have the same issues as the left engine oil will read higher than the right engine oil but my dip sticks are the same length and same have the same calibration marks. Ideas ?
bernie