Zurn Z1194 Oil Level Sensor Retrofit These Oil Level Sensor Retrofit Kits Feature: a fiberglass sensor box containing an electronic oil level sensor, a fiberglass display box with one green power light, red oil level light, audible alarm, and junction box. To be used for retrofit applications on Zurn Z1186 and Z1188 oil interceptors. Power supply 100 to 240 VAC at 47 to 63 Hz, G.F.C.I.