Tacho in diesel

I'm in exactly the same boat. Not so much a problem when just cruising around but I would like to know what revs I'm doing when working it hard in soft sand for instance. Looking forward to the responses.

May take a bit of mucking about but . What diesels lack, as you know is a source of an impulse . You could fashion an opto isolator or similar device near your main pully and have it straddle 2 slots to give you the impulses you require . If you are not into electronics it may be a bit difficult so ask around at jaycar or the like

Remembering that if you have a 4 cylinder it depends on 2 impulses per revolution of the crankshaft
If you have a 6 cylinder it depends on 3 impulses per revolution of the crankshaft.
Hope I havn't confused you but this may give you something to start with.

Dave L

check www.lcool.org

You say that only one that you found is expensive $200 isnt expensive for a VDO Gauge. VDO are also TOP quality, so you pay for what you get.

ALso if its the only one, why wouldnt it be expensive? You cant go elsewhere.

I've posted this before, but here it is again.
I had the same problem with the Humvee (6.2l V8 diesel), although it does have a tacho output for a milspec test box nothing local could read the output.
After a search on the net I found the Tiny Tach (www.tinytach.com)
Works on any diesel engine, gives total running hours, two service intervals (time based) and maximum revs reached as well as RPM in single rev increments.
Just clamp the sensor on any injector line, hook up the ground wire and connect power (anything from 9v battery up).
It powers on and off automatically(detects revs).
The only downside I've found is that it has no light for nighttime use which I solved by mounting a red led in front of it and masking the led so it only lit the display up.
mine has worked perfectly for nearly two years now.
they also make them for single cylinder 2 strokes as well as any other motor.
cost $us65 from memory, ended up being about $au100 inc postage by the time it arrived.
I have no affiliation except as a satisfied customer.
Peter