TechnoVersions TachMatch for Current-Driven Tachs
Some earlier vehicles (such as the early 70's Datsuns and Smiths/Jaeger tachs labeled as RVI on the face) use a current-driven tachometer instead of a voltage-driven tachometer. These types of tachometers can usually be identified by some loops of wire around the connections at the back of the tachometer. It takes more current to drive these tachometers than can be provided by the TachMatch TM-02. The TachMatch model TM-02-I-Drive, is designed to work with this type of tachometer.