Megasquirt and Tach connection
06-11-2007, 03:22 PM
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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?
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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06-11-2007, 03:52 PM
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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...
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...
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Jerry a.k.a. 'FoundSoul'
DIYAutoTune.com
'91 Miata BEGi S3 GT2560 w/ MSPNP - 14.1psi - 253whp, 232wtq
'95 Miata n/a
A few other cars....
Jerry a.k.a. 'FoundSoul'
DIYAutoTune.com
'91 Miata BEGi S3 GT2560 w/ MSPNP - 14.1psi - 253whp, 232wtq
'95 Miata n/a
A few other cars....
Last edited by FoundSoul; 06-12-2007 at 12:45 PM.
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