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How do I wire up my RVI tachometer? |
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Impulse tachometers (Universal and Original Equipment)
The equipment consists of an indicator head and a pulse lead. The pulse lead, when connected in series between the contact breaker terminal on the engine ignition coil and the contact breaker terminal on the distributor, will transmit voltage pulses to the indicator head. There are impulse tachometers to suit various types of engines i.e. 4 cylinder, 6 cylinder, 8 cylinder etc.
The identification code numbers printed on the dials of all Smiths impulse tachometers are prefixed RVI. Universal impulse tachometers can be identified by the 3 terminal block on the rear of the case and impulse tachometers fitted by the vehicle manufacturers as original equipment, by the single terminal on the rear of the case. The majority of tachometers fitted by the manufacturer are Negative Earth types. These are also usually the blocking oscillator types which can be identified by the absence of the pulse loop. Impulse tachometer. Check that the iron core and pulse lead assembly is as shown below. The pulse lead should form a symmetrical loop and should not be tight enough to pull the plastic former out of line, as this may well cause a poor electrical connection at the iron core. Poor connection may well result in intermittent operation of the tachometer.
The pulse loop is somewhat different and mounted inside the instrument case If you have or will fit any type of electronic ignition system or sports coils to your vehicle, you would need to send it to us so that we can convert your RVI tachometer to run with this set-up.
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