While getting ready to order the FS450M, I changed my plans. I ended up buying the JPI 751, an engine analyzer with two 4" screens. It's approved as primary for CHT and oil temp. I added the fuel flow option, and it also comes with TIT, OAT, Volts, and 12 EGT/12CHT probes. I will eventually add RPM/MAP, oil pressure, and fuel pressure to give me a full view of both engines.
Unforutnatly it's not approves as primary for all instruments, so I'll have to keep some of the stock gauges. When I do a whole new panel my plan is to replace the primary gauges with different ones that have remote sensors so I can get the wet lines out of the cockpit.
For the price it was about 1/3 the price of a complete primary certified display. It was almost the same price as the "skymaster" version of the Insight G4. They aren't shipping the G4 yet but they'll pre-sell it to you and give you two G3 head units now. I ended up going with the JPI because the screens were larger.
Here's a pic of it in a different plane, this is how I plan to mount it.
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