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Testing 7000 series tachometer
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CrestonM View Drop Down
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Joined: 08 Sep 2014
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Points: 8457 		Post Options Post Options   Thanks (0) Thanks(0)   Quote CrestonM Quote  Post ReplyReply Direct Link To This Post Posted: 12 Apr 2023 at 6:54am
Well then I owe Tim an apology! I didn’t think of it that way. It’s no secret math wasn’t my best subject So how do I go about figuring what size pulley to get?
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Tbone95 View Drop Down
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Joined: 31 Aug 2012
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Points: 12256 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Tbone95 Quote  Post ReplyReply Direct Link To This Post Posted: 12 Apr 2023 at 6:59am
Divide the diameter of your current pulley by 1.25.  I don't know if that's realistic, but that's how you'd change the ratio.
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CrestonM View Drop Down
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Joined: 08 Sep 2014
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Points: 8457 		Post Options Post Options   Thanks (0) Thanks(0)   Quote CrestonM Quote  Post ReplyReply Direct Link To This Post Posted: 12 Apr 2023 at 7:13am
Thank you, I’ll see what I can find. What would be nice is if there was an adjustment on the tachometer to compensate for slightly incorrect readings.
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Most of the aftermarket automotive tachometers do have a way to adjust between 4-6-8 cylinder engines. I have no idea if yours has any provision for this, but I suspect that there was some way of calibrating this at the factory.
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SteveM C/IL View Drop Down
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Joined: 12 Sep 2009
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Points: 8688 		Post Options Post Options   Thanks (0) Thanks(0)   Quote SteveM C/IL Quote  Post ReplyReply Direct Link To This Post Posted: 12 Apr 2023 at 1:09pm
Originally posted by Les Kerf Les Kerf wrote:

Most of the aftermarket automotive tachometers do have a way to adjust between 4-6-8 cylinder engines. I have no idea if yours has any provision for this, but I suspect that there was some way of calibrating this at the factory.
Those would be for electronic ignition systems not fuel injection.
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Originally posted by SteveM C/IL SteveM C/IL wrote:

Originally posted by Les Kerf Les Kerf wrote:

Most of the aftermarket automotive tachometers do have a way to adjust between 4-6-8 cylinder engines. I have no idea if yours has any provision for this, but I suspect that there was some way of calibrating this at the factory.
Those would be for electronic ignition systems not fuel injection.


Correct.
But I was under the impression that the tach in question here receives its signal from the alternator, which sounds like it might be kinda sorta electronic. I could be wrong though  ;-)
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CrestonM View Drop Down
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Points: 8457 		Post Options Post Options   Thanks (0) Thanks(0)   Quote CrestonM Quote  Post ReplyReply Direct Link To This Post Posted: 12 Apr 2023 at 10:44pm
Correct, it does run off a pulse signal.
A lot of aftermarket gauges get their signal via induction from a spark plug wire, right?
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Points: 1423 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Les Kerf Quote  Post ReplyReply Direct Link To This Post Posted: 13 Apr 2023 at 6:17am
Originally posted by CrestonM CrestonM wrote:

Correct, it does run off a pulse signal.
A lot of aftermarket gauges get their signal via induction from a spark plug wire, right?


All of the tachometers I have used get their signal from the low-voltage side of the coil.

The alternator style tachs are just a simple frequency counter that turns this signal into an analog signal to drive the indicator needle.

I'm going to hazard a guess that whoever designed the tach also put some means of calibrating it into the circuitry (it would be pretty dumb not to) to allow it to be used on various applications. This calibration adjustment may not be readily accessible to the end user though.
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Ron(AB) View Drop Down
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Joined: 27 Dec 2009
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Points: 962 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Ron(AB) Quote  Post ReplyReply Direct Link To This Post Posted: 13 Apr 2023 at 8:10am
Originally posted by Kevin in WA Kevin in WA wrote:

I put an 8000 series tach in my 7050, the pickup reads off the ring gear, I had mine split for PD work so it was easy to drill with the adapter plate off the machine. I located the pickup on the RH side where there is more room, no fuel filter there like on the 8000s.



We need a picture(s).

There is a lot of 7000 series with non functioning tachs.
405, 7000, 7050, 8050, 8070, L3, 2300 & 2600 disk
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Tim NH View Drop Down
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Points: 1128 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Tim NH Quote  Post ReplyReply Direct Link To This Post Posted: 13 Apr 2023 at 5:57pm
I'll let you slide Creston, lol. Use a impact wrench to take the pulley off. Then go see what NAPA can get you.
   Tim
1950 WD 1959 D14 1955 WD45 1976 7000 B 207
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CrestonM View Drop Down
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Points: 8457 		Post Options Post Options   Thanks (0) Thanks(0)   Quote CrestonM Quote  Post ReplyReply Direct Link To This Post Posted: 14 Apr 2023 at 8:18am
That’s probably what I’ll do. I may also check with McMaster Carr if Napa doesn’t have it.
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