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Author Topic: Looking for basic tach info ie., How to/what to install on an old 2 stroke?  (Read 1192 times)
zubzub
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'53 4104. Roadworthy but rough around the edges.


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« on: December 20, 2007, 03:33:21 PM »

Since I am going to be upgrading my wiring anyway, and I've always driven with tachs on my gas vehicles,  I am interested in any info regarding different brands / systems I can retrofit on an 671.   I don't even know how these work, do I install a sensor on a pulley?  Also aprox cost would be appreciated.  Thanks and merry Roshanukwanzmass.  Patrick.
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TomC
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« Reply #1 on: December 20, 2007, 03:39:53 PM »

On most 2 strokers, there will be a tach generator drive on the blower somewhere.  On my 8V-71, I had one on the back side of the blower and put the tack generator there and run a 3000rpm ISSPRO tach with engine hour meter.  Works well.  Good Luck, TomC
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Tom & Donna Christman. '77 AMGeneral 10240B; 8V-71TATAIC V730.
NewbeeMC9
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« Reply #2 on: December 20, 2007, 03:44:35 PM »

I have a 3k ISSPRO also,  the signal comes off the alternator.
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junkman42
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« Reply #3 on: December 20, 2007, 04:08:12 PM »

I also have an issapro made by vdo.  Picks up pulse off of r terminal on alternator.  Bought unit from us coach and found price to be far cheaper than most supply houses.  John
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JackConrad
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« Reply #4 on: December 20, 2007, 04:51:22 PM »

    I also have a 3000 RPM tach that uses a signal from the R terminal on the alternator.  I purchased mine from Precision Speedometer in Phoniex, AZ. It came already programmed for my altermnator. I bought mine several years ago and I think it was about $80.00 
    It is standard 3 11/16" gauge and installed it where the OEM air pressure gauge was ( I replaceed the air pressure gauge with a 2 1/16" air pressure gauge).  Jack
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bobofthenorth
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« Reply #5 on: December 20, 2007, 04:53:42 PM »

I have a VDO that I recently replaced.  The original took its signal off a tach drive on what I consider the "back" of the battleship on the 8-92 (towards the front of the bus)  The new one didn't recognize the signal & I wasn't smart enough to figure out why so I just took the signal off the AC terminal on the alternator.
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R.J.(Bob) Evans
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zubzub
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« Reply #6 on: December 21, 2007, 02:17:45 AM »

Thanks everyone, this will give me enough info to start looking.  Patrick.
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bobofthenorth
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« Reply #7 on: December 21, 2007, 04:14:33 PM »

I bought mine online somewhere but can't remember where.  If I was at the stick house I could find the receipt but it is C O L D cold there now so ............. sorry but it ain't gonna happen.  If you're still looking in about late April let me know.
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R.J.(Bob) Evans
1981 Prevost 8-92, 10 spd
My website
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Simply growing older is not the same as living.
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