SubSonic I wouldn't wanna bet my life on that gadget, 2 if you're too cheap to do what
MadJock suggests..and you wanna bet you're life on uncertified technology...Well I can't stop you...I wont use it!
BTW what is so hard about partial panel?...

the only thing you can't do is an instruement takeoff but in reality an instrument takeoff is not to be advised...also really heavy IMC in SE airplanes is not a practice I'd recommend...I'd hate to lose an engine and not see where I'm going to land...

In Fact -and call me hard hearted-but I think IFR training is best started on the PP, with some excercises -- no VSI-because in the US a VSI is optional instrument equipment...
Edit if you saw my other optional STC'ed and TSO'd male equipment you wouldn't say anything is -'ess' about me--- maybe not a perfect 10 but a 9 for sure...