Good eye!
On Amazon (as much as I hate to support them) - - I spend so much there that if I don't order for a week or two they call me to ask if there's any wrong.
Inclinometer
I'd give it a 5 star rating for $37 it cost. Excellent, easy to see, calibrate is one button. I installed in on the lip centered on and above the LCD display. Didn't use their supplied sticky, used 3M VHB double sided tape after cleaning surfaces with alcohol.
wiring is through a hole I drilled through the upper glareshield just to the left edge of the unit. Drilled an an angle toward the left side to avoid the instrument cluster. Remove cup holder to see and fish wire, then to the under hood etc.
I did make the mistake of ordering a multiple display unit from the same company. It had GPS, a TPMS (tire pressure monitoring system) etc. However, the instructions sucketh mightily so programming is a nightmare (not so on the simple inclinometer), but the big glitch was more than a 5 psi error spread in the TPMS senders.
There would be just one change I'd make on the inclinometer. Display has a resolution of 5 degrees. You can roughly discern 2.5 degrees as the display increments. 5 degrees is okay, and it tells you when your sphincter muscles are wrong (also when they were right I guess!). Definitely work two twenties.