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Old 06-11-2007, 04:22 PM   #1
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Default Megasquirt and Tach connection

How do you guys hookup the factory tach to your megasquirt system?
I'm installing MS II ver 3.0 with EDIS and a relay board and I'm trying to figure out the easiest way to hookup my factory tach to EDIS/ MS-II.
Connecting the tach to pin 11? (diagnostic or clean tach out) is "iffy", as per Matt Cramers post. The other option that has been recommended is fabricating a tach driver as per the megamanual on EDIS.
Thoughts? Comments?
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Old 06-11-2007, 04:52 PM   #2
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What year is your car?

The 90-93 doesn't normally need the ECU to drive the tach, but will in your case since you swapped in EDIS and removed the stock ignitors which drive the tach. The 94-95 does and is looking for a 12v square wave. With the MS-1 Extra code the tacho output mod works fine to drive it. With EDIS and MS-II you'll probably need to do the EDIS tach driver as per the megamanual. Check it with a scope if possible to look for a 12v square wave signal...

Last edited by FoundSoul; 06-12-2007 at 01:45 PM.
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Old 06-11-2007, 05:04 PM   #3
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The car is a 90 1.6. Wish I had a scope but don't have one...
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