Just find the original cvar.speed>1 in client.cpp (it should be commented out) and replace it with this code
register the cvars
Code:

   if ( cvar.speed>1 )
   {
      extern DWORD speed_ticks_left;
      extern DWORD phase_ticks_left;

      int speedbar_x = displayCenterX*2 - 100;
      int speedbar_y = displayCenterY*2 - 195;
      ColorEntry* clr=colorList.get(13);
      
      if(cvar.speedoff == 0 )
      {
         DrawHudString(cvar.speedbar_x-11,cvar.speedbar_y, 0, 0, 0, "SpeeD: NoLimiT");
      }
      else
      {
         if(speed_ticks_left) DrawHudString(cvar.speedbar_x,cvar.speedbar_y   ,clr->r,clr->g,clr->b, "speed: %d",speed_ticks_left );
         else                 DrawHudString(cvar.speedbar_x,cvar.speedbar_y-20,clr->r,clr->g,clr->b, "wait.. %d",phase_ticks_left );
      }
      if(cvar.speedbar == 1)
      {
         gEngfuncs.pfnFillRGBA(cvar.speedbar_x,cvar.speedbar_y,100,20,30,30,30,12);//background
         if(speed_ticks_left)
         {
            gEngfuncs.pfnFillRGBA(cvar.speedbar_x,cvar.speedbar_y,speed_ticks_left/(cvar.speedon/100),20,255,0,0,255);
         }
         else
         {
            gEngfuncs.pfnFillRGBA(cvar.speedbar_x,cvar.speedbar_y,phase_ticks_left/(cvar.speedoff/100),20,255,50,0,255);
         }

         if(speed_ticks_left)
         {
            DrawHudString(cvar.speedbar_x,cvar.speedbar_y,clr->r,clr->g,clr->b, "speed: %d",speed_ticks_left );
         }
         else
         {
            DrawHudString(cvar.speedbar_x,cvar.speedbar_y-20,clr->r,clr->g,clr->b, "wait.. %d",phase_ticks_left );
         }
      }

   }
}