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Tachometer Switch

981 Views 3 Replies 2 Participants Last post by  HeavyMetal
This may be in the wrong forum... any moderator please feel free to move it.

Ok... I need a switch that will activate at a certain RPM. I don't care if it is NC or NO; I'll make it work. My application is for an exhaust brake. I would like it to cut out below 1000 RPM. (see truck details is sig)

I have seen tachs with shift lights, which might work, but what I don't need is another gauge; I have enough cluttering my dash as it is.

Any help you guys could give me would be greatly appreciated.

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Ok, I found a tach switch, but I am not sure if it will work.

<span style="color: #FF0000">Click here-> Murphy Instrumentation</span>

The specs are:
• Minimum Input Voltage Signal: 4.5 Vrms.
• Maximum Input Voltage Signal: 50 Vrms.
Frequency range in Hz:
25-2000 or 625-9000

Does anyone know the specs for the tach on the 7.3? I'll hunt them down if someone can point me in the right direction.
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: mudguppy</div><div class="ubbcode-body">i thought you weren't supposed to use an exhaust brake w/ the GV OD??</div></div>

Never heard of that... I've had mine installed since the truck was new and never had a moments trouble. It does tend to want to jump from overdrive to direct on hard deceleration in 2nd (using L-1-2-3-4-OD gear nomenclature), so I have learned not to use the exhaust brake in 2nd/OD. Other than that little quirk, the two perform flawlessly together.
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