Congratulations on the purchase of your 240SX and welcome to the club. Zilvia has a lot of information posted that will help you fix all the issues that are currently affecting your car. All you have to do is use the SEARCH function here on Zilvia to find your answer.
Since you mentioned you have a Digital cluster, you probably have one of the earlier S13's, 1989..1990 model year. [EDIT...oops...you mentioned a KA24DE motor...you may have a later model year..1991-1993 - sorry not familiar with S13's as I am S14's] To learn more about your S13 and to figure out how to repair it, use the SEARCH function here on Zilvia and locate a FACTORY SERVICE MANUAL, (FSM), for your model year car. The FSM is a great help in finding & fixing the problems that are troubling your car.
As for repairing your Digital Cluster, check out the following two links:
From Zilvia.net
http://zilvia.net/f/archive-faqs/160...-your-hud.html
From Nicoclub.com....another good place for Nissan info
How to:Repair 240sx digital speedometer with HUD. NICO Club
Anyhow, hope this helps & welcome to the club....
ID
PS:
Don't be turned off by some of the responses you get to your postings. Sometimes we get a little "snippy" around here....Just ignore those responses. Most people will try to help you out if they can.