Factory tach mod?

[motornut]

need to hardwire it
maybe check it loose under the hood
any idea what it's from?
got any pics
no chance it's a six cyl eh(would prob bounce not steady)
not sure if a four would exist but would the signal double up?duno
there is one someone did it with a gas gauge face
and another cool one is a camero tach in there too
heck if you want i could have a look at it.....i did mine with a trailer plug for ez in/out