Yes, but to prevent having different layers of fluid we recommend fully draining, rinsing, drying and then refilling.
Once you have fully drained, rinsed and dried out your gauge you can fill it with glycerin, silicone or mineral oil.
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- Remove the black rubber fill plug and drain the gauge.
- Rinse the gauge with water, drain and allow to dry. Repeat until you have removed all of the silicone from the gauge.
- Refill with glycerin, silicone, or mineral oil. Leave an air bubble to allow room for the fluid to expand when the gauge heats up.
- Carefully reinstall the rubber fill plug.
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