i see the hole in housing , may put my mech guage there and compare readings. I went thru the guage issue with oil press also. 3 guages had 3 readings. +- 3 psi.If i can get to town today will look for a spacer also. will try a 1/2 in one. my rad sits at a slight angle and closest blade is about 1.25 in from rad.will check pump price while there also.wonder if its worth getting a gasket and pulling pump to see what it looks like. where would one find the infra red thermo?