The shaft speed monitor includes a hub with a bearing bore with an open end and a bearing end. A bearing stop flange is adjacent to the bearing end. A bearing is pressed into the bearing bore and is seated against the stop flange. A lock ring axially fixes the bearing in the bearing bore. A bobbin with an embedded multi-pole ring magnet and a coil is inserted into the bearing bore in the hub. A spindle with a toothed ring passes through the bearing. The toothed ring is in radial alignment with the ring magnet. Leads connected to the coil pass through a grommet. The grommet is held in a grommet slot in the hub. A seal is pressed into a seal counter bore in the hub and seals against a sealed surface on the spindle as well as against the grommet.