This app was mentioned in 1 comment, with an average of 2.00 upvotes
Shameless plug: If you have an Android phone or tablet, you can use it as flight instruments with this app:
https://play.google.com/store/apps/details?id=com.xplanesteamgaugespro
There's a free version with just two instruments here:
https://play.google.com/store/apps/details?id=com.xplanesteamgauges
Full disclosure: I made this.