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el sid



Member Since: 06 Sep 2025
Location: devon
Posts: 4
England 1996 Defender 90 300 Tdi CSW Barolo Black
Rev gauge.
Has any one fitted a cheap rev counter to a 300TDI,if so which one?i know about the vdo ones, but if a cheap one works ,why not?(yep buy twice,i know Laughing )
Post #1075047 8th Sep 2025 6:21pm
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julian



Member Since: 17 Feb 2017
Location: Devon
Posts: 194
United Kingdom 1994 Defender 110 300 Tdi CSW Alpine White
I've got a cheap 52mm eBay one on mine.

Runs off the w terminal. Looks in keeping with the other gauges (white led, not green though)

You have to calibrate them using a tacho, or just roughly by experience.

They're about £25 ish, iirc.
Post #1075049 8th Sep 2025 7:08pm
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el sid



Member Since: 06 Sep 2025
Location: devon
Posts: 4
England 1996 Defender 90 300 Tdi CSW Barolo Black
Ive seen some where that you set them at tickover revs ie 750 to 800,is that what you mean?
Post #1075053 8th Sep 2025 7:42pm
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julian



Member Since: 17 Feb 2017
Location: Devon
Posts: 194
United Kingdom 1994 Defender 110 300 Tdi CSW Alpine White
Out of the box, they "know" that "zero" pulses from the w terminal is 0rpm.

But, say you rev to 1000rpm - some setups will put out more pulses than others at that engine speed.

So you need to take it to a know rpm (doesn't really matter what that is, so long as you know it) and then dial the gauge to that rpm.

Then it will know that zero pulses means 0rpm and whatever it gets when you told it 1000rpm is 1000rpm, and, from that, it can, more or less, scale all the other values.
Post #1075054 8th Sep 2025 7:49pm
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Hazza



Member Since: 10 Jan 2011
Location: North Yorkshire / Leeds
Posts: 237
United Kingdom 1990 Defender 110 Td5 HT Bronze Green
Most of the cheap ones can be prized apart, then you can put a dab of green glass paint on the LEDs to change the colour. Someone more skilled could probably change the LEDs to green! 1990 Defender 110 200TDI Camper - now converted to Td5 power
Post #1075060 8th Sep 2025 9:06pm
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el sid



Member Since: 06 Sep 2025
Location: devon
Posts: 4
England 1996 Defender 90 300 Tdi CSW Barolo Black
julian wrote:
Out of the box, they "know" that "zero" pulses from the w terminal is 0rpm.

But, say you rev to 1000rpm - some setups will put out more pulses than others at that engine speed.

So you need to take it to a know rpm (doesn't really matter what that is, so long as you know it) and then dial the gauge to that rpm.

Then it will know that zero pulses means 0rpm and whatever it gets when you told it 1000rpm is 1000rpm, and, from that, it can, more or less, scale all the other values.
THANKS, THATS MADE IT MORE CLEAR ON HOW THEY WORK.
Post #1075068 8th Sep 2025 10:05pm
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