Tach to Pcm

[1970 CST Short Wide]

Originally Posted by 1970 CST Short Wide

Thank you, that helps a lot
Steve

Tried the 1K resister and it made my tack go backwards

[BBPanel]

Originally Posted by 1970 CST Short Wide

Tried the 1K resister and it made my tack go backwards

The purpose of the pull-up resistor is to change the +5v pcm tach signal to +12v - it worked for me on my Autometer tach. Sure you have the resistor in the correct direction - have no idea what it will do if not.

Here's a reference: http://aeromotiveinc.com/wp-content/...leShooting.pdf

[1970 CST Short Wide]

Originally Posted by BBPanel

The purpose of the pull-up resistor is to change the +5v pcm tach signal to +12v - it worked for me on my Autometer tach. Sure you have the resistor in the correct direction - have no idea what it will do if not.

Tried both power and lead to pcm. Lead did nothing power went backwards