erratic inductive tach..need coax wire?

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Posts: 184
Joined: 05 Oct 2014, 13:19

erratic inductive tach..need coax wire?

Post by Sinkingfast » 27 Aug 2016, 01:06

Both my tinytach and my hardline tach are all over the place. The first tinytach I had used a coax wire with a grounded shield. That one was fine. The last tiny and hardline do not use the coax wire. I have read about others with the same erratic issues. I am going to replace the wire on my hardline tach with coax and i will report how it works.

Any other suggestions?
2 stroke every time I can
4 stroke only when I have to..I don't like boating with my lawn mower

Al U Minium
Posts: 115
Joined: 17 Apr 2016, 19:24

erratic inductive tach..need coax wire?

Post by Al U Minium » 27 Aug 2016, 11:58

Routing of the wire near a high signal noise source; ignition, transducer, radio transmit antenna, can induce unwanted signals into the tachometer device.
1. The pickup sensor must be properly mounted
2. Route the sensor wires away from noise sources, do not run parallel with other wires
3. Coax may help but the first two mentioned are the most critical
4. The device you are using is defective

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