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Couple of errors and no tach

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Old Dec 13, 2009 | 09:13 PM
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Default Couple of errors and no tach
My Autometer Sport Comp tach is not working. It's reading 0

I'm using an 05 truck ECM and I'm getting the following codes
PCM] P0650 - Malfunction Indicator Lamp (MIL) Control Circuit
[PCM] P0654 - Engine RPM Output Circuit Malfunction (Pending)
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Old Dec 13, 2009 | 11:36 PM
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I got te P0650 cleared up, but still no tach function.
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Old Dec 14, 2009 | 12:11 AM
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this will get you going...tach should be set on 4 cylinder to read correct, unless programming was done in the PCM to change that.

, I know this has been covered many times...
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Old Dec 14, 2009 | 07:08 AM
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yeah, I've seen that, but nobody mentioned the error code

stopping by radio shack tonight
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Old Dec 20, 2009 | 05:58 PM
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If my stock tach is an 8 cylinder setup can I half the resistence (340ohm) and get the correct output on my tach or am I hoping too much that something like that would work?
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Old Dec 20, 2009 | 10:51 PM
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Originally Posted by iansane
If my stock tach is an 8 cylinder setup can I half the resistence (340ohm) and get the correct output on my tach or am I hoping too much that something like that would work?
No

you need to change the tach output in the tune
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Old Dec 20, 2009 | 10:58 PM
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Yeah, figured. Wishful thinking. I have no way of changing that.
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Old Dec 21, 2009 | 04:54 AM
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Originally Posted by iansane
Yeah, figured. Wishful thinking. I have no way of changing that.
Dakota Digital makes a small tach interface box that will change the signal, if you don't want to have it changed with a tune.
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Old Dec 21, 2009 | 10:33 AM
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Originally Posted by LS1MCSS
Originally Posted by iansane
Yeah, figured. Wishful thinking. I have no way of changing that.
Dakota Digital makes a small tach interface box that will change the signal, if you don't want to have it changed with a tune.
SGI-8 is what you need. It's pretty simple to hook up, works well and the instructions are excellent. Did I mention the whole thing is slightly larger than a cell phone?
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