“Gauge looks good so far haven't used it yet. It arrived with needle not on zero and no instructions accompanying the product. When I took the little rubber bung out of the top to equalise the pressure, some oil ran out because I didn't have the gauge completely vertical. Now there is a huge bubble in the gauge and I don't know what oil I could use to re-fil it. Onec again, no instructions with it.”
Hi Danny. All liquid filled gauges need to be reset to atmoshpheric pressure from time to time. Also a bubble in the liquid is to be expected. You can refill with glycerene if you desire
