Diesel Tachometer for Dieselgas

==> So I asked if I got a electric tacho and ran the wire that is meant to go to the coil on a petrol car to this wire would it work? He said that is should.

LOL!!! LMAO!!! ROFLMAO!!!

Mate, do you always believe all those hmm.... ... whatever...

You can get data from alternator, but you need special circuit to read those very small pulses. Plus you also need to know how many phases alternator has (usually 3) and what is ratio between engine pulley and alternator one, and this is vary dramatically from car to car. Ordinary aftermarket tachos use incredibly high voltage impulse in ignition wire to get data and this method does not require any calibration (apart of knowing how many cylinders in car). Getting data in diesel clumsier. Toyota uses special sender in high pressure pump for example. Also I have read somewhere that there is aftermarket tacho that uses pulses from pipe to one of injectors. I was thinking to get one by myself, but did not like it because it totally digital. For tune-up I am using optical tacho and plan to make similar for permanent installation.

Cheers.

A lot of manufacturers make alternator tachos. Like VDO for example. The pick up their pulse from the N or S terminal on a star wound stator or from one phase on a delta wound stator. These points produce an Ac wave and the tacho actually measures this. Of course, the ratio of the alternator and crankshaft pulley goes into the equation. The calculation allows for 2% belt slippage.

Clever little gnomes these germans.

But, not to worry about all the technical stuff, go and find a specialised instrrument dealer like one of the VDO service agents and they will sort you out. (I was one for near 27 years here in Brisbane)

Cheers

Mark T

I have found these which I think I will go for

www.fdrive.com.au/products/05/tiny.php

They have a dealer in welshpool in perth. They said to come up and they will check tranducer size for me. About $150.
Matt

Matt

The 80 series GXL has an electric tacho, so since they all seem to have the same wiring loom chances are the signal is available in the circuitry somewhere.

My Gregory's for the diesel 80s shows the tacho in the wiring diagrams, fed by a black wire from the "pickup sensor". You'd have to be able to find the wire somewhere - the book says nothing in the text that i can see about where the sensor is though. I reckon I'd scratch around in the back of the instrument panel looking for a black wire heading for the general area of the speedo, and see if you can get a signal off it.

The other possibility is to go to the Landcruiser Owners on line site ( www.lcool.org/index.html ) and look for an article on the subject or ask the question there.

I reckon you have a chance
Max

Hey Matt,

Let me know if you need any wiring schematics for engine to tacho from a workshop manual. My 100 series with 1HZ has a factory tacho, can scan info from my Gregory's. Might be able to use this and modify for your vehicle?

Ross.

It seems to me that you have a few options, but you dont want to spend the money...the lpg tuners advice was good, maybe he wasnt expecting you to go to the wreckers and buy an aftermatket tacho from an old datto....