I have seen those newer style tachs that have the magnet u place on the flywheel and as it spins it counts the rpms to a remote read out, anyone ever use these, do they work on the older motors where tachs are hard to find?
I had a miniature tach that worked off the # 1 plug wire for 10 years or so before it stopped. It had signs that moisture got to it over the years. I w/n concerned how accurate it was vs letting me know I had dropped RPMs that I had when it was running good. I am the Tach now on my 1970 35 HP Chrysler. LOL. I doubt that I searched for another nor did I find a name on the attached unit. Probably any Inductive Auto Tach would serve the purpose I used it for (but not at the prices at the link below). jow
Same thing as the electronic speedo I used on my race motorbike. Put a sensor on the front disk brake, and a sender unit on the yoke, and the speedo worked off a magnetic pulse. Same theory I suppose, just counting pulses. Make sure the pick up isn't so big as to put your flywheel out of balance.
I now have a 'tiny tach' for mine. Seems to work a treat.
Same thing as the electronic speedo I used on my race motorbike. Put a sensor on the front disk brake, and a sender unit on the yoke, and the speedo worked off a magnetic pulse. Same theory I suppose, just counting pulses. Make sure the pick up isn't so big as to put your flywheel out of balance.
I now have a 'tiny tach' for mine. Seems to work a treat.
My Speedo was within a poofeenth of 100%- it's how you set it. I would imagine the instructions will give you something like ' set at TDC, measure flywheel, turn flywheel, measure and set firing order' Bingo Bango, a new tacho. Again, just make double sure that the flywheel isn't out of balance.
I'd go a Tiny Tach- bought mine on ebay for $35.00. Extended the coax cable for $15.00 and senses the spark. I wouldn't mess with the flywheel. Reccommended INstallation to minimise balance issues- anywhere but the flywheel!
LOL, I guess that makes sense. I will look into those tiny tachs and at 35$, thats a little cheaper then what I was going for. Does that have a digital read out, or a standard tach?
Its a digital readout, and about 2.5 inches wide by maybe .5 inch high. It measures actual engine hours, and is suitable for outboard use- just get the right one....
