JMP oil temperature direct meter / analogue display The original oil filler plug must be replaced with the direct blade. Please note that the probe is often only wetted with spun oil. A measurement on, for example, the oil drain plug therefore gives a different value. NOTE: Please carefully compare the thread diameter, pitch and length of the oil dipstick with the replacement part! ATTENTION: The air bubble in the sight glass secures the expansion of the damping oil when heated, no reason for complaint!