With the autobrakes,the reverse thrust simply reduces the brakes force to achieve the preset decelration
With RTO position selected the autobrakes slam on full available brake pressure.
True,i had in mind the autobrake in the landing mode not RTO,in the latter case full hydraulic pressure is used.
Thrust reverse use in that case adds to deceleration just as during manual braking.
Now, if a significant airspeed discrepancy is noticed between the PF and PNF ASI readings at the 80 knot or 100 knot call, and there is momentary uncertainty which one is correct, a glance at the ground speed indication will offer a clue. if necessary, the pilot can fall back on the ground speed display to take whatever action is appropriate. Normally it is safer to keep going rather than risk a high speed abort.
How about the stby instrument?
