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Old 08-12-2010, 10:08 PM   #1
Scooby Newbie
Member#: 93364
Join Date: Aug 2005
Chapter/Region: RMIC
Location: Arvada CO
1998 '98 Impreza RST
'14 BRZ

Default Tachometer Signal/Testing

My standalone ECU is running a 36-2-2-2 trigger wheel but my factory cluster's tach is wired for a 6/7 trigger wheel so I have a problem because the factory ECU is not seeing an engine speed, therefore not sending the proper waveform signal to the needle motor in the cluster. Is there a way to get the waveform signal from the coil or anything else to get the factory tach needle to work?

Car is a 1998 2.5RS with a megasquirt ECU. I actually had the tach working for a test setup but I cannot seem to get it working again.

Is there a way to test the needle motor to see if it is burned out?
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Old 06-30-2011, 07:23 AM   #2
Scooby Newbie
Member#: 287036
Join Date: Jun 2011


I'm having a similar issue as you describe... I have a standalone ECU that reads from a 36-2-2-2 wheel and cant get the factory tach to work anymore.

I was under the impression it might be from an inline "pickup or holdup" device that would alter the voltage between the ECU and tach... but cant seem to locate it. Any other thoughts?

'92 legacy turbo
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