You should NOT rely on a generic answer here. The most accurate information is found in:
1. The sticker on your driver's side doorjamb: This sticker will specify the recommended tire pressure for your vehicle, taking into account the factory-installed tire size. This is the best source of information.
2. Your owner's manual: If you have the owner's manual, it will also list the recommended tire pressure. Look for a section on tires or maintenance.
3. The sidewall of your tires: The maximum pressure for your tires is printed on the sidewall. Never exceed this maximum. However, this is the *maximum* and not necessarily the *recommended* pressure. The doorjamb sticker or owner's manual pressure will likely be lower.
In short: Check your driver's side doorjamb and/or your owner's manual. Those sources will provide the correct tire pressure for your specific 1988 Lincoln Town Car.