post #1 of Old 03-05-2013, 09:26 AM Thread Starter
blaylock6502
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Location: Wadesville
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Autometer tach in a cj5

I put an autometer ultralight 2 in my 74 cj5. It is very jumpy and inaccurate. I contacted autometer and they said to put a 10k ohm .5 watt resistor inline with the signal wire to try to buffer some of the noise. I plan to do this was just curious if anyone had run into the same thing??

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post #2 of Old 03-05-2013, 10:29 AM
OleBlue73
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Quote:
Originally Posted by blaylock6502
I put an autometer ultralight 2 in my 74 cj5. It is very jumpy and inaccurate. I contacted autometer and they said to put a 10k ohm .5 watt resistor inline with the signal wire to try to buffer some of the noise. I plan to do this was just curious if anyone had run into the same thing??
Yes. It's due to the electrical interference (laymen's terms) given off by the plug wires. If you have a radio, you are probably experiencing speaker hum too. You can also swap to a higher suppression plug wire set, but the resistor is the cheaper route.

1973 CJ5, 304, T15, D20
2009 JKU, Rubicon
2005 TJ, X, 4.0, 6 speed
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post #3 of Old 03-05-2013, 10:50 AM Thread Starter
blaylock6502
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Thanks a ton! I am a gm tech and have a ton of 10k 1/4 watt resistor will that work or do I need to find a 1/2 watt??
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post #4 of Old 03-05-2013, 11:00 AM
OleBlue73
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You could try what you have and if it doesn't work, find a 1/2 watt.

1973 CJ5, 304, T15, D20
2009 JKU, Rubicon
2005 TJ, X, 4.0, 6 speed
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