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View Full Version : Tacho- Really could use some suggestions!



ThorneGator
23rd June 2016, 05:46 PM
So, have spent hours and hours and hours pouring through searches and forums to realize I might be up the proverbial creek.

Skip this paragraph if you don't want a rant:angel:
After reading a fellow Landy owner worked with XXXXXXXX:censored:, I thought I could trust them to supply me with the correct tacho for my vehicle (2005 TD5 110). I was wrong! Instead I was sold the VDO tach that works on 4,6,8 cyl (supposedly can be tweeked for 5 cyl) that attaches to the W-terminal of the alternator. Unfortunately, the TD5 doesn't come with a W-terminal on the alternator either.
So, after asking ahead of time those questions, I was still assured the tach would work.....may be they know something I don't know!:confused: But I do know my business will not be going to them XXXXXXXXX again!:censored:
Return here if you skipped above....
Anyways, the tach (part#VDO 333 035 017 G) is installed. Wires attached correctly (triple checked). I used my testing cable to connect the signal wire from the tach to the pink and yellow wire leaving Pin 19 on Black ECU plug. The tester shows a pulsatile signal, but no response from the needle on the tach.
I have read that the signal is not strong enough for the non-TD5 tach. However, I have also read that Lowtension (no longer in business) had tweaked these tachs to accept the signal.
Can this be done? Can I some how increase the sensitivity of the gauge? If not, is this going to be another expensive mistake? Any help would be very welcome.:confused:

Tombie
23rd June 2016, 05:48 PM
The VDO unit sold to you is not suitable for purpose - just return it and get the TD5 tacho.

Making it work is a PITA...

Tombie
23rd June 2016, 05:51 PM
This is the part you want...
YAE100790

manofaus
24th June 2016, 04:30 PM
I couldn't justify the cost of the vdo one. I might give this idea a Crack. You might be able do do it to the one you have.
DEFENDER2.NET - View topic - Anybody fitted a rev counter? (http://www.defender2.net/forum/topic16094-15.html)
Is it legal to post from another forum?

ThorneGator
26th June 2016, 08:17 AM
I couldn't justify the cost of the vdo one. I might give this idea a Crack. You might be able do do it to the one you have.
DEFENDER2.NET - View topic - Anybody fitted a rev counter? (http://www.defender2.net/forum/topic16094-15.html)
Is it legal to post from another forum?


Great thread on this, and confirms my thoughts/ worries.

I can't return the gauge since the needle was painted (white) to match the stock gauges:(

I was recommended to Airco gauges in Sydney, and will talk with them to see what can be done to boost the 5V signal to 12V or increase the sensitivity of the gauge to read the ECU/ 5V signal.

Thanks again everyone!

ThorneGator
26th June 2016, 08:19 AM
This is the part you want...
YAE100790

Thanks Tombie, I have priced those out, and now the price point is usually >$500......Don't think I need the tach that bad:confused:

PhilipA
26th June 2016, 09:03 AM
You could also try this mob who have a good reputation.

Manly Auto Instrument Repairs Pty Ltd

General Instruments - Allambie, NSW

441 Condamine St, Allambie NSW 2100



Ratings & Reviews
Phone (02) 9938 4114

(tel:0299384114)




Regards Philip A

Aaron IIA
26th June 2016, 10:14 AM
A simple amplifier circuit would boost the signal to a suitable level to energise the tachometer.

Aaron

ThorneGator
26th June 2016, 06:48 PM
You could also try this mob who have a good reputation.

Manly Auto Instrument Repairs Pty Ltd

General Instruments - Allambie, NSW

441 Condamine St, Allambie NSW 2100



Ratings & Reviews
Phone (02) 9938 4114
(tel:0299384114)
Thank you Phillip, will do.
(tel:0299384114)




Regards Philip A

Thank you Phillip, will do.

ThorneGator
26th June 2016, 06:52 PM
A simple amplifier circuit would boost the signal to a suitable level to energise the tachometer.

Aaron


Thank Aaron,

I'm decent with wiring, but wouldn't have clue as to what the amplifier circuit should look like or where to install. Any thoughts?

Defendozer
28th June 2016, 06:46 PM
Hi mate

I think it might just be that model tacho? Because my Td5 has the 8000rpm VDO tacho and it works fine.. Not sure exactly how its wired as it was fitted by the previous owner but in terms of functionality its fine.

mattims
28th June 2016, 07:07 PM
Thank Aaron,

I'm decent with wiring, but wouldn't have clue as to what the amplifier circuit should look like or where to install. Any thoughts?


I have used this product from sparkfun (actually an older version but this one is better) to do similiar things for 5V to 12V logic in car stuff. It actually has 4 channels but you only need one for a tacho. It's really just a transistor and a few resistors on a board but its easy to wire in this way. and its only $3 but postage from sparkfun would be silly if thats all your buying I think.

https://www.sparkfun.com/products/12009

This is an ebay link to something else premade that should work.

2X Level Shifter Logic Level Converter 12 Channel 5V to 12V or 12V to 5V | eBay (http://www.ebay.com/itm/2x-Level-Shifter-Logic-Level-Converter-12-Channel-5V-to-12V-or-12V-to-5V-/251606065490)