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November 16th, 2006, 09:08 PM
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#1 |
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Newbie
Join Date: Aug 2006
Posts: 21
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Tach install Quick question please!!
Ok guys I need a little help.
I just installed a sunpro tach ( cp2012) I took the signal off my ecu. Same place as my raptor shift light & my msd window switch. But the tach won't rise above 800rpms Do I have to have a tach adaptor? And if so Why? Please reply Troy |
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November 16th, 2006, 09:30 PM
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#2 |
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MM's nicest mod, :)
 
Join Date: Aug 2005
Location: Apex, NC
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do you have a digital window switch
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06 Dodge MegaCab Diesel 455rwhp/815rwtq REAL TRUCKS DON'T USE SPARK PLUGS |
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November 16th, 2006, 09:32 PM
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#3 |
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MM's nicest mod, :)
Join Date: Aug 2005
Location: Apex, NC
Posts: 3,718
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oh now that i think about it you will need a tach adapter, the signal the tach needs is a 12v square wave pulse and the signal coming from that wire is a sine wave. The raptor shift light works there cause it is programed to read the sine wave and same with the window switch.
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06 Dodge MegaCab Diesel 455rwhp/815rwtq REAL TRUCKS DON'T USE SPARK PLUGS |
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November 16th, 2006, 09:40 PM
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#4 |
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MM's nicest mod, :)
Join Date: Aug 2005
Location: Apex, NC
Posts: 3,718
iTrader: 0 reviews
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so in instance you are only reading off one coil right now. thats why if you multiply the max rpms the tach will go by 8 then it would read normal lol
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06 Dodge MegaCab Diesel 455rwhp/815rwtq REAL TRUCKS DON'T USE SPARK PLUGS |
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November 16th, 2006, 09:42 PM
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#5 | |
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Newbie
Join Date: Aug 2006
Posts: 21
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November 16th, 2006, 09:47 PM
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#6 |
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MM's nicest mod, :)
Join Date: Aug 2005
Location: Apex, NC
Posts: 3,718
iTrader: 0 reviews
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your still gonna need a tach adapter cause the window switch is programed to read off one coil also. you can find them for around 40 bucks used
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06 Dodge MegaCab Diesel 455rwhp/815rwtq REAL TRUCKS DON'T USE SPARK PLUGS |
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November 16th, 2006, 09:53 PM
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#7 | |
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Newbie
Join Date: Aug 2006
Posts: 21
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I'll start looking. Do you have an extra one in your pocket 
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November 16th, 2006, 10:09 PM
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#8 |
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MM's nicest mod, :)
Join Date: Aug 2005
Location: Apex, NC
Posts: 3,718
iTrader: 0 reviews
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nope just the one already on the car
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06 Dodge MegaCab Diesel 455rwhp/815rwtq REAL TRUCKS DON'T USE SPARK PLUGS |
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November 17th, 2006, 06:40 AM
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#9 |
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Newbie
Join Date: Aug 2006
Posts: 21
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Oh cool that one will work
 I'll stop down later and pull it out of your car.Thanks Troy |
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