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Old 09-16-2013, 01:04 PM   #1
MrPulldown OP
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Location: Truckee
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digital tach install

I went about hooking one of these digital tach/hour meters up this weekend.
http://www.ebay.com/itm/Digital-Tach...item3f28b7798b
There are only two leads. One to wrap around the spark plug wire and one to hook to a chassis ground. I only hooked up the spark plug wire wire. Set the tach for 2 sparks per revolution and fired the bike up. Seems to read pretty good. Do I need to hook up the ground wire.

Will it give me a better reading?
Is it there for the hour meter?
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Old 09-17-2013, 10:45 AM   #2
MrPulldown OP
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Has no one used one of these? Seems like a decent thing to have. So last night I buttoned up the wring and rode the bike in to work. I did ground out the ground wire to a frame lug (confirmed ground). The tach works OK. Slow to respond though. Takes a second or two after each shift to register the right RPMs. If you are accelerating hard and banging through the gears it hardly registers the drop in RPMs as you upshift. You are back up the displayed RPM before it has time to register the drop. Not as easy to read as a needle. But not bad for seeing the RPMs when you are wound out on the highway.

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MrPulldown screwed with this post 09-17-2013 at 12:16 PM
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Old 09-17-2013, 11:11 AM   #3
H96669
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Sure I had one....a Tiny-Tach when they came out in the early 90's.Yours looks like a "copy". Same too slow to register, I took it off. They seem to have improved them, faster update....every half second so maybe the copies will speed up someday.

http://www.tinytachuk.com/
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Old 09-17-2013, 11:46 AM   #4
Beezer
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I have used several brands... the Tinytach is the best of the bunch. the TT uses 2 wires, I installed another that was single wire pickup but it was not as stable and yep, slow update time... they are best for a more industrial application.

for a better display try a Trailtech or (my favorite) Acewell.... made for bikes
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