First is having a thread pattern to match the OPS's (oil pressure switch) threads. The kit I bought didn't have what I needed. The threads may seem to match the OPS, but will not screw in. I had to take my gauge to Amazon Hose in Tampa, and they instantly knew what the issue was and made the modifications required so my gage hose would screw into the engine case.Greg, could you go over the procedure of checking the oil pressure? I have a oem filter and would like to know what pressure I'm getting. I would like to monitor the pressure periodically and see if I have any changes occur toward the end of it's life span and the pressure with a new filter after an oil change. I would like to know where you are hooking your gauge into.
As for access ... the OPS sits above the oil filter. To access it the lower center cowl needs removed, its protective boot pulled away, and its wire removed. The remove the OPS and screw in your gauge, which can be done without removing the oil filter; however, it is much faster to remove the filter first. Before running an oil pressure test, be sure to check you oil lever.
To check the oil pressure, the oil needs to be at operating temperature. I always do mine on a center stand, in 'N", I wait for the fans to come on, and the reading is taken at 5,000 rpms. Depending on what year Service Manual you read it is either 76 or 78psi.