So I'm installing a D10A (with the magnetometer and OAT) in my PA-28 because the vacuum powered attitude indicator died. Is anybody else surprised? In any event, the aircraft is VFR only so technically (Part 91.205), I don't need any magnetic heading besides the whiskey compass so I'm removing the vacuum powered DG and vacuum system. In order to become ADSB out compliant and for cross country navigation, I'm installing a Garmin 400W and would like to install a second D10A as a full time HSI displaying the Garmin data. Besides connecting the 2 D10A's together via the DSAB and connection the output of the 400W, are there any other technical issues I'll run into?