tacho wire

Engines, Transmissions & Final Drive questions and answers

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sabretooth
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Postby sabretooth » Thu Mar 20, 2008 10:57 pm

I just went through this with my MegaSquirt.

Connect the AC line to the AC pressure switch (consult your wiring diagram). Also connect the condensor fan relay to this.

As for the tach, I don't know what that ECU accepts, but for my MegaSquirt I had to put a 1k resistor between the tach line and 12v for it to get a signal.
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ampz
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Postby ampz » Fri Mar 21, 2008 12:02 pm

You need to output an rpm signal from you ecu, or build a driver circuit from you cas signal.

Your coils don't have an rpm output wire (Neither do the NA6s but the ignitor does this for them)...
Huh?
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sabretooth
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Postby sabretooth » Fri Mar 21, 2008 12:42 pm

There is a simple amp circuit you can make to drive the tach, if your ECU is capable of outputting the correct signal.
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sabretooth
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Postby sabretooth » Sun Mar 23, 2008 10:19 pm

You don't need to fiddle with the gauge cluster - tach generally is black with white stripe.

Unfortunately I don't do Microtech stuff so I can't tell you what you need to actually do.

Sean -may- be able to help.
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ampz
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Postby ampz » Mon Mar 24, 2008 9:49 am

According to System wiring diagrams from Madracki system diagrams page 8
I would look at pin 2K on your harness (green/orange) for your tach sense to cluster.

Use it at your own risk though. :mrgreen:
Huh?
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