Try this;
Code:
Mainloop:
TMR0 = 0 ' clear count before each pass
PAUSE 5000 ' give it some time to count pulses
Revs = TMR0 ' get TMR0 count
Counter = Counter + 1
LCDOUT $FE,1,"Counter1: ", DEC Counter
LCDOUT $FE,$C0, "Revs: ", DEC Revs
GOTO Mainloop
Counter of course is always going to change every 5 seconds or so, but Revs shouldn't until you have pulses in on RA4.

Timer0 will automatically count pulses. You don't need to check any regs, bits, etc, just read it & clear it as required.