portion 132 a tip of the gauge sits in the oil flow path and dynamically measures the temperature of the oil flow a lower portion 120 of part 107 of the housing 102 serves as a bearing retainer to retain in place the bearing 44 see fig4 e an inline flow meter 121 which measures oil flow to the housing has an oil inlet port 122 magnetic plugs 123 are positioned in holes 124 to attract and hold metal shavings and debris an air breather 125 is in communication with the interior of the housing 120 as shown in fig4 b and 4e the cartridge 115 has a part 115 b which is adjacent a part 115 a the part 115 a includes an upper part 115 g and a side 115 f the part 115 b is encompassed within structure of the part 115 a upper part 115 g and side 115 f and a top surface 107 a of the part 107 the part 115 a rests on a top surface 107 b of the part 107 and against a side 107 c of the part 107 in one aspect the top surface 107 a is lower than top surface 107 b due to the tolerances between the part 115 b and the part 115 a some slight movement is possible of the part 115 b with respect to the part 115 a an interface between.