Looking for basic tach info ie., How to/what to install on an old 2 stroke?

zubzub · 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.

TomC · 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

NewbeeMC9 · December 20, 2007, 03:44:35 PM

I have a 3k ISSPRO also, the signal comes off the alternator.

junkman42 · 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

JackConrad · 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

bobofthenorth · 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.

zubzub · December 21, 2007, 02:17:45 AM

Thanks everyone, this will give me enough info to start looking. Patrick.

bobofthenorth · 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.