E-38 Tach output

[MSURacing]

Hey Guys,

So, I am working on a customers sprint car that we have an E-38 in and I would like to get a Autometer tach working. Problem is, what do I tell the computer to get the correct output signal.

Thanks for any help at all,

[67LS3]

may be too late. the tach setup should be set for crank and high and low pulses set to 15. the autometer tach should be set for 4 cyl mode. we had to put a pull up resistor in the signal wire also. you may not. we have a e38 with an ls3

[MSURacing]

Thanks,
I will have to give this a try when the car comes back in. What type of resistor did you use and what did you pull it up to, 12 or 5 volts?
Thanks,

[doubledip]

680ohm resistor between the 12v ignition wire and the tacho input wire which basically jumps a 5v signal upto 9v and there you go a tach signal

try that

[MSURacing]

Worked Great, I actually only had 1.2k ohm resistors, so I paralleled 2 of them and soldered in and everything worked. Thanks for the info and help.