You can easily spend several hundred dollars on a professional-quality crimper.  But we have found that if one is slow and careful they can get very acceptable crimps with this much more attractively-priced crimper.  When used specifically as intended (for the crimp terminals on sealed Metripack connectors, using wire gauges from 22-14) that this tool provides a great bang-for-the-buck for the average weekend EFI enthusiast.  

This crimper includes 3 different size openings for the electrical connections and two different openings for crimping around the seal.  If you've never crimped before, you might take a moment to look at any of the several good instructional videos available on YouTube.  (Search for 'crimp metripack connector" and you'll find several.)

We also offer a selection of terminals for the more common automotive EFI connectors.  The Tyco / Amp SuperSeal terminals are used in the connectors that mate to the Holley HP and Dominator ECU's.  While some of these wires are only 20 AWG, you can get just as effective of a crimp by doubling the wire over and using these terminals made for 16-18 AWG (and reduce the number of terminals you have to keep on hand.)

As with everything we sell, if you have any questions you are welcome to contact us for answers!