supra8

I have searched, but did not find info on what needs to be done to get a stock 82 Supra 6cyl tach to read from the LS1 tach signal. I have used EFILive to reset the tach signal to give 3 pulses per revolution and tried with and without the 12v pullup signal enabled. The tach does nothing.
Anybody know what the Toyota tach needs? It was originally driven by a signal which from what I can determine is a 12v pulsed signal from the ignitor.

Thanks for any help.
Keith

philntx

iTrader: (8)

Take a look at this and see if it provides any insight:

http://www.mindspring.com/~jayk3/toyota/tachmod.htm

supra8

Thanks. I have seen that. It deals with making a 4cyl tach work with a 6 or 8 cyl signal. My problem seems to be that my tach does not respond to the square wave signal that the LSx computer puts out. I think I need some way to convert it to a pulsed signal.

Keith

supra8

Ok, I got it figured out. Used an MSD-8920 tach adapter that is designed to convert the 12v square wave output of an MSD box to a pulse signal that a voltage triggered tach can understand. Hooked it up between the LS1 PCM tach output and the Toyota tach and now the tach works.

Keith