The OPT-1 is more readable than the factory Cessna oil pressure/temp gauges.
- Customer
Daniel N. From California
- Aircraft
Cessna 175 Skylark
- EI Instrument
8am–4:30pm PST M–F
Sorry, We’re Closed
A-102 Adapter Plate
A-102
$28
Lead Time: Usually ships within 2–3 business days.

The OPT-1 is more readable than the factory Cessna oil pressure/temp gauges.
Good to go! Excellent instructions and easy install. Outstanding instrument!
Easy installation, lightweight solution. It looks good and is easy to use. [I chose E.I. because] I needed to replace my old Hobbs meter. This provided more functionality, allowing me to remove my old digital timer, and EI programmed it to my current airframe time.
Excellent installation instructions [&] recommend[ed] by others.
Your customer service is excellent and your products are top quality!
The tach looks and operates amazing. Extremely accurate.
Awesome Tech Support. Like the functions it supports and the fit and look in the panel.
Very impressed with the clarity and readability of the CGR-30P gauge.
Installation went great. The Fuel Flow is dead on.
Good support when we called with particular questions with the initial setup. We liked the functions and the price.
Customer Service is far superior… with an excellent record of resolving … technical issues.
Very affordable… great installation instructions. [I chose EI because of its] price point, certified primary.