Keep Moritz gauges with GI275 EIS?

[AspiringOwner]

Looking to replace my EDM 700 with a Garmin GI275 EIS. Shop mentioned he would have to remove the Moritz gauges as GI 275 being primary could not coexist with any other primary gauges per STC. Anybody else run into this problem? I would like to keep the Moritz gauges.  Don't really understand the argument that two "primary" gauges cannot coexist for possible confusion - since I can have two attitude indicators, and those disagreeing in IMC would really be confusing...

[jetdriven]

The factory gauges are required to be removed for the STC for the 275. Not only that, but the Moritz  isn’t serviceable anymore, and eventually more and more parts of it are going to fail. It’s got sensors under the cowling. You either gonna have a tee off of to use the garment stuff or you’re gonna have separate hoses and sensors for all of that stuff as well.   It’s the whole rationale for going with an aftermarket engine monitor to begin with. As far as what you need to get home safely, I would argue the only thing you need is an oil pressure gauge. Everything else is nice to have, but not required for safety of flight. 

Edited July 26 by jetdriven

[rklems]

As @jetdriven notes, it is an STC requirement. The specific verbiage from the STC install manual that prohibits it is in 3.2.3

"4. No indication/parameter on the EIS display(s) can be duplicated by any other installed indicator that is not connected to the GEA."

Duplicating all that is just more failure points and additional weight. If this is a huge dealbreaker for you, there are other primary EIS systems that don't have this prohibition on duplicating indications. However, I really don't recommend going down that path.