If you loose your pitot, the only instrument which will be affected would be the ASI.
Ah but again it is recognising the fact. In fact it nearly killed a friend of mine. He was giving another friend a joy ride, and this particular person ...how shall I put it.....had obviously eaten all the pies
In short after takeoff on the climb out, un beknown to my mate the ASI started to give false readings, and of course as he climbed the ASI dropped causing him to increase power and lower the nose. He thought he'd made a serious mistake in weight and balance calcs, and ended up looking for a field to dump it in. I think it was GPS that finally saved him, he figured that with a GS of 150kts, there was no way he could be doing 75 kts IAS. The Pitot had become blocked.
There was a case saveral years ago of a 727 (I think) which crased and killed everyone onboard. Turned out the Pitot tube became blocked, and as they climbed higher the ASI reading increases, so they kept pitching up and ended up stalling.....
Cheers
EA