Meep-Meep
дворянин
I am doing some work on a buddies 69 GTX so he can get it ready to sell and one of the things on my list is to install the repo factory tach similar what is shown here -
http://firebird1979.com/serverfiles/fbshopmain2.asp?hid=112AR9915
I can't say for sure that the Year One tach pictured here is the exact same as what I was supplied with (hard to believe there are multiple vendors for this unit) but the problem I'm having is it's very sensitive to stray magnetic fields.
The design of the meter movement seems to incorporate about a billion miles of fine copper wire and since the center in dash speaker is in close proximity to the factory tach location it affects the meter movement. The speaker is a Pioneer replacement with a larger than standard magnet and when a copper coil is in the presence of a magnetic field it induces a voltage sufficient enough to wreak havoc with the meter movement. Effects of the magnetic field are seen as much as a foot away. I tested the tach on the fender and it worked fine but as I got close with the speaker it went to 4000 RPM and the reading would change as I moved the speaker. The solution in this case was to remove the speaker, which is no big deal since most people put the speakers in the back driven by the killer 500 megawatt stereo :tongueflap:
Anyway, just an FYI.
http://firebird1979.com/serverfiles/fbshopmain2.asp?hid=112AR9915
I can't say for sure that the Year One tach pictured here is the exact same as what I was supplied with (hard to believe there are multiple vendors for this unit) but the problem I'm having is it's very sensitive to stray magnetic fields.
The design of the meter movement seems to incorporate about a billion miles of fine copper wire and since the center in dash speaker is in close proximity to the factory tach location it affects the meter movement. The speaker is a Pioneer replacement with a larger than standard magnet and when a copper coil is in the presence of a magnetic field it induces a voltage sufficient enough to wreak havoc with the meter movement. Effects of the magnetic field are seen as much as a foot away. I tested the tach on the fender and it worked fine but as I got close with the speaker it went to 4000 RPM and the reading would change as I moved the speaker. The solution in this case was to remove the speaker, which is no big deal since most people put the speakers in the back driven by the killer 500 megawatt stereo :tongueflap:
Anyway, just an FYI.
