Is there any real time charting software that shows lines for important levels from the previous day? For example, let's say you have a 1-day chart on your screen. It would have horizontal lines for one or more of the following: yesterday's high, low and close. I hate to waste screen space with a 2-day chart if I can get by with a 1-day.
Yes, RavenQuote has a built in study which will place horizontal chart lines based upon user selected criteria, including previous bar's open, high, low, close and current bar's OHLC. Setting the timeframe to daily and selecting previous OHLC (or HL, or whatever combination), will yield the results you are looking for. Ensign Windows w/Esignal feed also provides a similar feature.