PIREP on installing CIES fuel senders in a C182P with EI CGR-30P.
The original plan was to ignore the old resistive fuel senders and use the fuel flow and accurate dip sticks. That failed due to the combination of fuel level being shown in tenths of a gallon and the Aircraft Spruce “Cessna” dipsticks being way off. This I believe is due to our use of the outboard filler holes. I know, just calibrate your own. But sometimes your partner doesn’t agree.
So off to install CIES senders. Remove the overhead and kick panels. Drain the fuel.
Things learned the hard way. CIES installation instructions call for using an oscilloscope to check the square wave output is correct and correctly oriented before installing the senders. Turns out scopes are common in electronics shops but not so much in avionics shops.
Avionics advice was “just hook up to CGR to test before install”. Which leads to second important lesson.
EI has to create a new configuration file to accept the magnetic senders. Other than a $300 charge, no problem. Except what is not published is that EI takes 2 weeks to build the config file after you pay. So if you take the airplane down and follow the instructions, your plane will be down for 2 weeks.
Known, based on installation instructions, was that a power wire is needed to be run for each sender and the signal wires must be disconnected from the resistive fuel sender module and run to different pins on the EDC.
Will update after we get the config file and get a chance to do the full install.

PNW Flyer wrote: ...sometimes your partner doesn’t agree.

I'm not telling you not to spend the money, but I'd bet you could have calibrated a stick without your partner even knowing.

No mistake, I have calibrated a dip stick. But having halfway accurate fuel gauges is a requirement and ours are not at the moment.