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Tachometer Repair & Recalibration

Posted by 3066james 
3066james Avatar
Jim Cheatham
Amelia, VA, USA   usa

I need to have my tach repaired and recalibrated. In an Internet search, I found an article at ClassicTiger.com by someone named Mark Olson. I called Mark and he said he can repair and recalibrated my tach. The article is at www.ClassicTiger.com/techtips/motach.html

Has anyone on this forum heard of and used Mark to repair or recalibrated their tach? Just want to check before I send my tach to someone without checking for references.

Thanks
Jim
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ingoldsb Avatar
Terry Ingoldsby
Calgary, Alberta, Canada   can
1971 MG MGB

I've read the article, and it is very good. I'm sure the author is aware that the tachs in the MGB used a similar, but not identical circuit. I don't know of the author's work, but the article seems to demonstrate competence.

I posted the circuit diagram for your tachometer some time ago - if you can't find it let me know and I'll send it to you.

What is wrong with your tach?



Terry Ingoldsby
terry.ingoldsby@DCExperts.com
Royal Lichter
Chicago, USA   usa

I would just use Nisonger. They've been in business since the 5th century BC and are extremely reputable. They're the official and only Smiths warranty facility in the United States.

They did a tach for my TR4A back in the summertime and did a great job. I sold the car and I now know that whoever drives it has a precision machine for the tach. tongue sticking out smiley
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mgcyclo Avatar
Tim Rich
Township of Washinghton, NJ, USA   usa

x2 Nisinger
SkyPilot101 Avatar
Greg Hannon
Philly Burbs, USA   usa
1963 MG MGB MkI "Yellow Hellion"

Nsionger is great - I used them for my Jaeger fuel guage.

I might need my tach calibrated also, but I am hesitant right now.

They quoted me a price of at least $175 + shipping for calibration.
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mac townsend Avatar
Fairfield, CA, USA   usa

or Palo Alto Speedometer who has been in business since 1957. A mile or so from Stanford University.

http://www.paspeedo.com/

Nisonger is closer to you, however.



1973 Roadster. A nice 50-footer!
SUs, Datsun 5-speed
MGB Tips and Tricks: www.mgrescue.com
ingoldsb Avatar
Terry Ingoldsby
Calgary, Alberta, Canada   can
1971 MG MGB

The only problem with Nisonger (and the others, AFAIK) is that they don't actually repair the tachs - they just put in new, modern electronics. That sounds great, except that for the older current sensing tachs, you will need to rewire as voltage sensing. Not a big deal, but it can be a lot of work if all that needs to be done is replace the capacitor.

In fairness, I'm not sure that they never repair the innards, but I know several people on the BBS have complained that when they got the tach back they had to rewire the car to match it. So, at least sometimes, the innards get replaced.



Terry Ingoldsby
terry.ingoldsby@DCExperts.com
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SkyPilot101 Avatar
Greg Hannon
Philly Burbs, USA   usa
1963 MG MGB MkI "Yellow Hellion"

The only problem with Nisonger (and the others, AFAIK) is that they don't actually repair the tachs - they just put in new, modern electronics. That sounds great, except that for the older current sensing tachs, you will need to rewire as voltage sensing. Not a big deal, but it can be a lot of work if all that needs to be done is replace the capacitor.

Thanks for the tip. Yes - on my fuel gauge, I called to discuss with them how I needed it to work for an early MGB. I guess the early ones are actually in part thermally based along the contacts (do I have that right)? So there is a big difference.

Also, I thought the price quoted was a bit high.
tannyo Avatar
Tanny O'Haley
North Hollywood, CA, USA   usa

You might want to call Morris Mintz at:

West Valley Instrument Specialists
19314 Vanowen St., Reseda, CA 91335
(818) 758-9500

He rebuilt my speedometer and converted my tach to negative ground.
SkyPilot101 Avatar
Greg Hannon
Philly Burbs, USA   usa
1963 MG MGB MkI "Yellow Hellion"

Thanks Tanny!
ingoldsb Avatar
Terry Ingoldsby
Calgary, Alberta, Canada   can
1971 MG MGB

Quote: You might want to call Morris Mintz

Hmm - I've heard of a Morris Minor, but never a Morris Mintz. spinning smiley sticking its tongue out



Terry Ingoldsby
terry.ingoldsby@DCExperts.com
3066james Avatar
Jim Cheatham
Amelia, VA, USA   usa

Thanks to everyone for suggestions. I have purchased a refurbished model RVI 1433/00 found on eBay. Cost was $89.00 + $10.00 shipping. I'll let you know how it works out.

Jim
Royal Lichter
Chicago, USA   usa

In reply to # 1960498 by ingoldsb The only problem with Nisonger (and the others, AFAIK) is that they don't actually repair the tachs - they just put in new, modern electronics. That sounds great, except that for the older current sensing tachs, you will need to rewire as voltage sensing. Not a big deal, but it can be a lot of work if all that needs to be done is replace the capacitor.

In fairness, I'm not sure that they never repair the innards, but I know several people on the BBS have complained that when they got the tach back they had to rewire the car to match it. So, at least sometimes, the innards get replaced.

I don't know that this is entirely true. I would call them for clarification on that.
MGB567 Avatar
Barrie Braxton
Sunshine Coast, Queensland, Australia   aus
1966 MG MGB MkI "Money Guzzler"

http://www.moss-europe.co.uk/Shop/ViewProducts.aspx?PlateIndexID=158

Curiosity on this topic got the better of me. I looked at Moss and saw replacement tachos are nla but not, apparently, on the sister's website (for one). Note the surcharge component of the price - if it costs more than GBP50 to send your broken one then don't - an exchange tacho (if I don't send mine) would cost around $160 plus postage. Are these no good?



CKD 11/66 first registered 8/5/67 owned since 3/77. Undergoing nut and bolt restoration. Tartan Red (now). 18GB +40 balanced with almost all new internals. Peter Burgess big valve fast road head. Piper 285. TT exhaust. ARP everywhere. 123 ign. Needham 4synchro c/r box. Stock rebuilt/replaced suspension. Superpro bushes. New brakes all round including all pipes in SS flex. Interior redone. CAMS approved roll bar and side bars. Lots more. Hybrid of o/e and show/fast road car. Not for sale - it's my toy!
azur10 Avatar
Franck Malissen
Fayetteville, NC, USA   usa
1967 MG MGB

I just had my tach and speedo repaired and calibrated to work with a Crane XR700 ignition in my 67B. Morris Mintz of West Valley Instruments did a fantastic job. Great communication, very fast (approx. 2 weeks from me sending the gauges), and very reasonable prices compared to Nisonger or Palo Alto Speedometer. I'd recommend Morris, you won't be disappointed.
And now that my speedometer has stopped bouncing all over the place and is recording true mileage, I have stopped crying about my gas mileage, yeeeaaaaaaah smileys with beer

Attachments:
IMG_20120129_163046.jpg (37.9 KB) –
IMG_20120129_163046.jpg

SkyPilot101 Avatar
Greg Hannon
Philly Burbs, USA   usa
1963 MG MGB MkI "Yellow Hellion"

Excellent Frank! I shared the Nisonger was $175 + shipping to re-calibrate a tach. If you don't mind, can you tell us what the California company charges? You don't have to, but it would help the members for cost comparison.
azur10 Avatar
Franck Malissen
Fayetteville, NC, USA   usa
1967 MG MGB

Morris at West Valley Instruments installed a new tachometer circuit board to make the tachometer compatible with the ignition system; the tach will work with either positive or negative ground, does not need the clip/loop but rather connects directly to the coil.
Cost of the upgrade was $160 + shipping; I told Morris to keep my original bezel and glass. His turnaround time was less than 2 weeks.
Palo Alto Speedometer quoted me $225 + shipping for the same upgrade, 2 weeks turnaround time
Nisonger quoted me $275 + shipping for the same upgrade, 4 weeks turn around time.
I also sent my bouncing speedo to Morris, which was repaired for $160 also, so I ended up paying $320 for both plus $10-15 shipping.
Both instruments came back clean, and work perfectly. I am very happy with the service.
Let us know how yours go.
Franck

Note: Nisonger also quoted me $175 to rebuild the tach but told me that it would not work with electronic ignition, so I would need the $275 upgrade.



Edited 1 time(s). Last edit at 02/08/2012 09:08AM by azur10.
SkyPilot101 Avatar
Greg Hannon
Philly Burbs, USA   usa
1963 MG MGB MkI "Yellow Hellion"

Gents and Ladies - hope you all don't mind me bringing up this older topic. With the Winter upon us, it is time for me to tackle some MGB projects. My broken tach is now front and center again.

What I found was the tach cable tip was not spinning at all when the engine was accelerated. I take it I need a new cable. I have an MGB converted to neg earth. the tach was working this sping, although it was reading 200 rpm ar idle. The tach itself is hopelessly out of calibration. It read 3500 when removed. I move the gauge trying to get the needle to zero again......it only reads higher.

I guess it goes to the West Valley or Nisonger....both price quotes for a rebuild seem about the same. My tach is a Jaeger.
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