Autometer playback tach reading low
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Joined: May 2012
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Autometer playback tach reading low I swapping out my digital rpm shift light with an Autometer playback tach. I've pretty much cut the wires to the shift light, matched the colors to the tach and connected them. Everything turned on the Autometer tach shows roughly .500 and stock tach shows roughly 1,100 rpm.
I do have a blue and gray wire off the tach that are not connected.
Any suggestions? Thanks!!
I do have a blue and gray wire off the tach that are not connected.
Any suggestions? Thanks!!
Thread Starter
TECH Regular
Joined: May 2012
Posts: 442
Likes: 0
I just checked my connections and everything looks good. Green wire connected to the white wire #10, I have power to the tach but the rpms are lower then the factory tach. I do have a blue and gray wire off the tach that's not connected.
Thread Starter
TECH Regular
Joined: May 2012
Posts: 442
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same problem here tapping rpm signal off PCM, currently set it to 6 cyl for most accurate reading. Always reads 500rpm lower than PCM from idle up.
Someone told me to tap rpm signal off a coil pack instead but haven't looked into it.
Someone told me to tap rpm signal off a coil pack instead but haven't looked into it.
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Like so?
http://www.autometer.com/resources/index/faq_view/id/77
10k resistor connecting signal and power wires behind the tach, correct?
Link says " I recommend starting with a 10K-1/2 watt resistor, though you may go as low as 5K- ½ watt" so how do you tell which one to use other than solder, test, clip, solder, test, clip.... I expect a butchered harness in an area without room to butcher.
What can be done with a multimeter to get as close as possible for the first test?
http://www.autometer.com/resources/index/faq_view/id/77
10k resistor connecting signal and power wires behind the tach, correct?
Link says " I recommend starting with a 10K-1/2 watt resistor, though you may go as low as 5K- ½ watt" so how do you tell which one to use other than solder, test, clip, solder, test, clip.... I expect a butchered harness in an area without room to butcher.
What can be done with a multimeter to get as close as possible for the first test?
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