Pontiac GTO hood tach and HP tuners "tach output" setting
#1
Launching!
Thread Starter
Pontiac GTO hood tach and HP tuners "tach output" setting
When looking for info, I searched and didn't find anything, so I figured I'd post my experience now that my issue is fixed.
We had to set the tach ouput setting to 3 to get the tach to read correctly. Now it's perfect!
Probably not alot of guys running factory hood tachometers with LS swaps, hence the lack of info.
Hope this helps someone else.
Thanks,
Jeff
We had to set the tach ouput setting to 3 to get the tach to read correctly. Now it's perfect!
Probably not alot of guys running factory hood tachometers with LS swaps, hence the lack of info.
Hope this helps someone else.
Thanks,
Jeff
#3
Launching!
Thread Starter
Just wire the tach output wire (from the PCM) to the tach input wire on the tach......where it originally came from the coil (or electonic ignition module). Leave the 12V and ground wire as-is.
Thanks,
Jeff
Thanks,
Jeff
#5
Which PCM are you using? I also have the factory hood tach on my 66 GTO I am using the E40 PCM from a 2006 GTO and harness from the 2006 also my engine is a LS2 & T56 from the 2006 GTO, but to get it to work I had to use the SGI-8 box from Dakota Digital.
#7
Did it require a pull up resistor? If not, do you remember what it did before you changed the ecu setting? I just hooked mine up as you described, but have not reflashed the ecu yet. Light comes on, but the needle doesn't move. I expected it to move but be off. I fear the tach could be bad.