I already had the rack on the Sun Speedster and before I sold it I decided to take some good pics of how I secured it to that bike before I removed it and added it to my (new to me) Easyracers.com Tour Easy LE.
You will need basic tools:
Some screws and matching nuts (some are supplied with the bike and/or the rack)
Some 1/8 thick x 3/4 wide x about 36" long aluminum strap from the hardware store
A Hack Saw
Hammer to bend with
Drill and drill bits that the screws fit into
Philips or Slotted (flat head) Screwdrivers
Cresent wrench or open/closed end wrench that fits your nuts
Step 1: Cutting, bending and attaching the straps
Then measure out the distance between the mount screws behind the seat and the underside of the rack adding for the bend and attachment of the screws on the frame at the back of the seat. Also adding for the length to secure the straps to the underside of the rear.
Cut to length. Then bend for the Bike mounts and then measure, mark and bend for the rack mounts. Cut excess off straps. I did one and then copied it for the second one. Drill the holes for the straps.
This rack came with the screws for the bottom mounts to the dropouts and the screws and nuts for the four holes on the rack itself. It also came with some short straps but they were thrown away after this project was completed. Rack was purchased at Wally World but you can get one anywhere.
This is a short instructable since I did not see one anywhere on the web on adding a rack to my Sun Speedster after I bought it and I thought it might help someone else to figure out how to add one to there recumbent bike.
This bike is no longer in production but there are several brands of recumbents in this same short wheelbase configuration so I did this for all you owners out there.