My second mechanical temp/oil gauge failed. The first one straight out of the box and outside of its warranty. The second one after a year. The oil gauge part of it was fine. Unlike my 1st Stag where the temp. gauge fluctuates, the second stags temp stayed quite constant in all types of driving. So, I decided not to spend another 100$ on a 3rd gauge, I'm going back to the stock electrical gauge. I did however calibrate the gauge and I created a video on how its calibrated. I opened up a spare gauge so you can see what the guts of it look like. I found details from other websites: https://youtu.be/1XvHm_cavTE
Sujit
Sujit