Schwanke Engines

iTrader: (1)

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,

wrencher

iTrader: (2)

The tach output on a a LSx is a 4cylinder output. Is that what you mean? I dont think you vcan modify that signal on a GM PCM.

Schwanke Engines

iTrader: (1)

Yep, the tach does have to be in 4 cyl. mode.
The problem is on the E-38 you can alter the output. We are having difficulties getting it to work and I wasn't sure if there were others trying to put a aftermarket tach on these controllers.

blackbyrd

iTrader: (14)

are you trying to figure out the pulses per revolution?

Schwanke Engines

iTrader: (1)

Yeah, that is where I am a little lost. Do you have one running?

blackbyrd

iTrader: (14)

im still using my factory ecm but i used a stewart warner tach and you had to use ppr settings to get it to read right, i will have to go back and look at it but i can get an answer for you if ppr is what you are after.

MEFISTUFF

we use a 1500 ohm pull up resistor w/ the autometer guages. set the range on the tach to 4 cyl. Questions ? give me a call @909 910 3867. Steve