HELP GAUGE REMOVAL /CUSTOM TACH

[Tev62]

The sensor is an inductive sensor. The holes don't cause an output, the metal bar between the holes do.

Here is a link that shows and explains how they work: https://cecas.clemson.edu/cvel/auto/sens...speed.html

I think Max mentioned that if you take a sensor and connect it to a meter (an analog one works great) and wave a screwdriver by the sensor head, you will see the needle move. I've done on many times on an Chevy crankshaft position sensor I have laying around.

The 90's Triumph's used these inductive sensors as a crankshaft position sensor (CPS). They caught many owners out in that they would fail when hot, conking out the bike. After 20-30 minutes they would cool down and work again allowing the owner to start the bike. A lot of head scratching followed?

If an owner did suspect the CPS you could easily test them by seeing if they were within the specified impedance range. All it took was a simple test with a cheap multimeter. Of course you usually tested when you got home after the bike had cooled and they always passed with flying colours.

I dread to think how many owners ripped the fuel lines and carbs apart looking for fuelling problems. These days the issue is so well known I would say almost every 90's Triumph owners has a spare one in their tool box box.