Fitting a tacho to a Perentie

[mick88]

Anyone fitted a tacho to their perentie?
If so what type?




Cheers, Mick.

[Mick_Marsh]

Very good question. I'd like to do the same thing.

[Homestar]

There would be 2 options as far as I could see.

Option 1 would be to convert the alternator so it has a 'W' terminal then run a tacho that can see that input - not sure what aftermarket tachos there are that will do this. The pulley ratios would need to be calculated.

Option 2 would be to use an aftermarket gauge (like a Murphy or Datcom unit) that picks up a signal from a mag pickup (speed sensor). Unless you have a hole drilled and tapped into the flywheel housing directly over the flywheel teeth, then this could potentially be a big job as you really need the engine out and the flywheel off to do this. You then just could the teeth on the flywheel and calibrate the unit. Our gensets use this style of sensing, usually into the control panel, but we do have some with gauges too.

Option 1 would be easier if you can find a tacho, option 2 will definitely work, but needs a hole drilled and tapped into the flywheel.

I'm sure there may be other ways - they are the 2 I know of.

EDIT - just having a think about it, a tacho like this - [ame="http://www.fwmurphy.com/uploaded/00-02-0260.pdf"]http://www.fwmurphy.com/uploaded/00-02-0260.pdf[/ame] that is designed to work of a mag pickup may still work off the 'W' terminal, depending on its calibration range, but someone smarter than me would need to work out the pulses per RPM that comes out of the alternator with its pulley ratios.

[Homestar]

Option 3 - cheap and nasty [ame=http://www.ebay.com.au/itm/Red-LED-4-Digital-Tachometer-RPM-Speed-Meter-NPN-Hall-Proximity-Switch-Sensor-/131184115267?pt=AU_B_I_Electrical_Test_Equipment&h ash=item1e8b2ebe43&_uhb=1]RED LED 4 Digital Tachometer RPM Speed Meter NPN Hall Proximity Switch Sensor | eBay[/ame]

Find a spot of the front pulley to glue a magnet to and make a bracket up to suit the sensor. It would work, but it would look like crap and be prone to mechanical damage.

EDIT - can anyone see these stupid links from ebay, or is it just me???

[Homestar]

This may be an easy solution - [ame="http://www.autometer.com/productPDF/608.pdf"]http://www.autometer.com/productPDF/608.pdf[/ame]

http://www.autometer.com/cat_gaugedetail.aspx?gid=2602

Looks like around $140 USD

[Mick_Marsh]

I'd like a nice looking tacho like that Murphy one. The next question would be where do you put it?

[isuzurover]

I recall isuzu have a genuine tach. There are also aftermarket tachs which attach a sensor to nr.1 injector pipe to measure fuel pulses.

[rovercare]

Tachometer for 4BD1?

[Bigbjorn]

I bought a genuine Isuzu tacho and sender from Zenith Engineering, the Isuzu industrial engine dealer in Brisbane. The sender replaces any one of the four threaded plugs underneath the injection pump.

[Bearman]

Here's where I mounted mine.The alternator photos can be found in the thread "alternator w connection". The three gauges on the dash top are from left, boost,egt and rpm.