Autometer Tach wiring

peregrine · Post by **peregrine** » Sat Feb 18, 2006 6:45 pm

well it looks like i found the problem to not being able to use a tach, http://www.egauges.com/pdf/AutoMeter/561.pdf , scroll to the bottom and youll see how to hook it up to a mitsu. the problem is, i went and bought this and theres a discrepancy with the wiring. on the above link it shows to cut and tap into the black and white wire but on the instructions that came with mine it doesnt have any wire colors.

i couldnt find any good wiring diagrams so can someone tell me if it is indeed the black and white wire i tap into? thanks in advance.

Mike · Post by **Mike** » Fri Feb 24, 2006 1:59 am

It is indeed a black/white wire. I tried hooking up my truck tack to the ECU pin 109 wire for the tach, how DJ and poorboyj did his, but it didn't work at all for me or poorboyj (the truck tachs must be different than the starion tachs). What worked for me was using the black/white tach test terminal wire hanging off the engine harness. Hope that helps.

peregrine · Post by **peregrine** » Sun Mar 19, 2006 12:13 pm

just for reference this unit does indeed work. its so simple its scary. it has nothing to do with the ecu. just takes the power pulses to the coil and converts them to a signal the tach can read. if your having tach problems this is an easy solution.

tjc · Post by **tjc** » Fri Apr 14, 2006 5:11 pm

Mike wrote:It is indeed a black/white wire. I tried hooking up my truck tack to the ECU pin 109 wire for the tach, how DJ and poorboyj did his, but it didn't work at all for me or poorboyj (the truck tachs must be different than the starion tachs). What worked for me was using the black/white tach test terminal wire hanging off the engine harness. Hope that helps.

My truck does not have a factory tac, it had a Sunpro hooked up to the coil. Will the black/white tach test terminal wire work with the sunpro-and if so, how do I locate it?

It that does not work, will the Autometer tach adapter Perigrine talks about work with the Sunpro or only with an autometer tach?

This is the last gague I need.

[/quote]

TruckA · Post by **TruckA** » Fri Apr 14, 2006 5:16 pm

Mine works fine wired in to the tach output from the ECU, I have an older used Autometer sport comp monster tach with no shift light. I just tied into the same place as where the SAFC II rpm source wire connects. Its pin 54 on the center connector to the ECU.

David

peregrine · Post by **peregrine** » Fri Apr 14, 2006 5:36 pm

tjc wrote:
Mike wrote:It is indeed a black/white wire. I tried hooking up my truck tack to the ECU pin 109 wire for the tach, how DJ and poorboyj did his, but it didn't work at all for me or poorboyj (the truck tachs must be different than the starion tachs). What worked for me was using the black/white tach test terminal wire hanging off the engine harness. Hope that helps.
My truck does not have a factory tac, it had a Sunpro hooked up to the coil. Will the black/white tach test terminal wire work with the sunpro-and if so, how do I locate it?

It that does not work, will the Autometer tach adapter Perigrine talks about work with the Sunpro or only with an autometer tach?

This is the last gague I need.

[/quote]it will work with any tach. post up your results.

tjc · Post by **tjc** » Fri Apr 14, 2006 8:19 pm

I found the tach wire from the ECU. It puts out a steady and very small voltage that increases with RPM and did not work with the sunpro tach.

Looks like I'll have to get the autometer tach adapter-I'll post when I figure out what works.

tjc · Post by **tjc** » Wed Apr 19, 2006 9:11 pm

It works. Black/white wire. Slpit the wire, red/green from adaptor goes to coil, red wire goes to ECU.