Bulldog6Z6:
DM makes the SpeedCal. Brothers' sells it under their house label, for a little less money, too. Nice product with factory style connectors, excellent installation instructions w/plenty of clear pictures, and the DM website has a calibration calculator for any oddball combination that you can throw at it. It will work fine with your +99 MANUAL transmission.
It is a fine product backed up with excellent customer support. Do a search and you will find that when people have problems (not many considering the number of units sold/in use), "TriBlkCobra" (designer of said SpeedCal) is there to help find the solution. No spam, just giving you my experience. My SpeedCal is almost 3 years old and still going strong.
Hope this helps.