I have this ongoing temp gauge issue on my 04 Civic. Just replaced the radiator, coolant temp sensor, thermal fan switch, thermostat,and upper and lower hoses. System has been bled numerous times and starting to think there is a malfunction within the gauge itself, but need a scanner that i can keep plugged in while i am driving it to monitor the temp.

does anyone have this tool and willing to lend it out for a few days so I can track this down or know where I can get one myself?