UW40074 Tachometer Adaptor Ring

Replaces number 156556A, OLS146

Fits: 550 SN: 93017 and up, 770, 880 when adapting OLS133 and OLS135 Tachometers

Used when hole in dash measures 3 3/4" diameter, 4" O.D., 3-5/16" I.D.