depending what oil pressure sender you have it might be best to use one of the remote T-pieces, I can't use one of the normal ones as when its done up tight the oil pressure sender won't screw in as the oil filter is too close
The electric pressure gauges still need a t piece as the temperature sender is 1/8npt but the advantage of an electric one Is you don't have to run a copper capillary tube through which looks messy and is not very flexible. But I opted for this type as it was cheaper