An electrical tachometer receives voltage pulses from the ignition system, usually the coil.
电器转速表从点火系统中接受电压脉冲，通常是线圈。
There is a best matching relation between ignition control module and ignition coil.
汽油机的点火控制器与点火线圈之间存在着一个最佳匹配关系。
Ignition coil primary winding. Current flow through the coil produces an electromagnetic field, which is used to induce a high voltage in the secondary coil.
点火线圈初级绕组。电流通过线圈，产生一个电磁场，用来在次级线圈中产生高电压。
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