There Are Lots Of Places Selling EFI Conversion Harnesses, But There Is Only One PSI

Customer Service

PSI has a growing reputation for outstanding customer service. Our customer service department can be reached five days a week. You will reach someone knowledgeable in EFI conversions and willing to do what it takes to get you on the road.

PSI is able to meet almost all customer requests, harnesses can be modified for changes such as injectors, transmissions, throttle bodies, MAF, and MAP sensors. PSI also has the capability to produce customized harnesses in small volumes. If you have a need for a harness for a specific application not offered, feel free to contact us. For additional information you can email us at info@psiconversion.com


With a combined 25+ years experience, the owners of PSI were looking for practical, intuitive solutions to electronic fuel injection conversions into older vehicles. With no appreciable support from the automotive aftermarket, PSI was formed. We have and continue to develop components and kits to meet your needs. If you don’t see it on the site, feel free to contact us, we are constantly adding new parts. If you have questions or concerns, we'd love to hear from you as well.