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Author Topic: Autometer tach failure  (Read 2675 times)
JO TYPE 3
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« on: April 22, 2008, 12:14:16 pm »
Hi,

I've tried this used Autometer 3905 tach recently (standard ignition, connected correct)
As you can see the pointer is a little bit nervous!?

Is the tach broken or what could be the problem, maybe anybody had this before?
Another tested Autometer tach worked perfect!

thank's Walter

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RedEx
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« Reply #1 on: April 22, 2008, 12:35:20 pm »
Parkinson I think...
 Grin
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Frank LUX
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« Reply #2 on: April 22, 2008, 13:00:20 pm »
That's one Funky Autometer Tach... Wink Grin Grin

Sorry Dude, at least yours is Moving...my Old School Autometer Tach does not even do that... Grin Grin Grin

Frank
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gibber!
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« Reply #3 on: April 22, 2008, 13:10:09 pm »
I know that a bad earth can make the needle dance a little, but nothing like that...!
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Rocket Ron
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It's old school for a reason
« Reply #4 on: April 22, 2008, 14:43:59 pm »
Is it set up for 4 cylinders ?

If you dont snip the wire loops at the back you can set a reading like that.

Sorry forgot which colours you need to snip but I can look tonight if you want, let me know

Ron
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Sam K
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« Reply #5 on: April 22, 2008, 14:51:07 pm »
If you've determined that everything is wired correctly, the problem is most likely a bad tach.  Fortunately, Autometer has pretty good customer service. If you send it to them for repair, they usually get it back to you within three weeks or so and it usually costs around $40.00. How do I know this? For some reason, my Bug seems to kill a monster tach every couple of years. I've never been able to figure out why. I've replaced every wire that has anything to do with the tach at least twice and I've spent a lot of time on the phone with Autometer's tech support guys picking their brains as well. Good luck!
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JO TYPE 3
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« Reply #6 on: April 22, 2008, 16:35:56 pm »
Quote from: rocket ron on April 22, 2008, 14:43:59 pm
Is it set up for 4 cylinders ?

If you dont snip the wire loops at the back you can set a reading like that.

Sorry forgot which colours you need to snip but I can look tonight if you want, let me know

Ron



thx so far

tach is 4 cyl. calibrated as in the instruction!
tried both, 1 and 2 pulse (btw. what is the right pulse for flat 4?)

I think I should really contact the Autometer support...
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Zach Gomulka
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« Reply #7 on: April 22, 2008, 17:47:11 pm »
Make sure the wire that goes back to the coil is nowhere near a spark plug lead, that will cause the tach to dance around like that.
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Gary Justus
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« Reply #8 on: April 23, 2008, 02:16:25 am »
Do you have a Compufire?.....If so, that may be the problem. The allen screw that holds the module to the dist. body is not tight. Take off the cap and rotor and snug that little guy up. That should do the trick.
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Gary Justus
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« Reply #9 on: April 23, 2008, 02:17:45 am »
oops....Just re-read. Check all grounds. Good Luck!
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JS
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« Reply #10 on: April 23, 2008, 07:30:49 am »
I have read something about putting a diode in serial on the lead coming from the coil to smooth out the pulses?
Anyone heard if it?
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