Sprint tach with EFI

[doghows]

Has anyone had any success installing an original 1963 tachometer with a modern EFI computer motor?
I've had the tach restored and re calibrate for a V-8 and I have to have it in my car. Problem I have a tach signal wire from my coil but the tach doesn't wire up that way, so I need to figure out how to make it work.
Anyone.......

Tach has three wire: green, red, black. Signal wire from the coil is green. Common sense says, green to green, black to ground and red to power. NOT. I've read somewhere about a filter to correct the signal but now I can't find the info. HELP.

[doghows]

Well research is showing me I'm screwed. Appears the the Falcon is one of the only cars to use this type tach. The wiring goes from the key to the tach then off to the coil. Thus making it a positive hookup compared to all the other tachs in the world that use a negative coil side for the tach signal.
Crap $450 down the toilet, guess I'll have to list it for sale.

[Nathan289]

You'll have to send that restored tach to me.

I'll send you my working non restored tach that you can then send out and have restored withnmodern parts

[doghows]

If it comes down to that well talk.

[Luva65wagon]

Well research is showing me I'm screwed. Appears the the Falcon is one of the only cars to use this type tach. The wiring goes from the key to the tach then off to the coil. Thus making it a positive hookup compared to all the other tachs in the world that use a negative coil side for the tach signal.
Crap $450 down the toilet, guess I'll have to list it for sale.

This is how I mentioned it was supposed to work, but I wouldn't consider it down the toilet - you'll sell it for that. I have a repop version I won at the meeting raffle in January or March, I'll swap you.

Have you contacted the restorers? Can they modify?

[doghows]

Post up a picture. I don't care if it's an original,I just want the vintage look in my car. You saw how cool that tach looked in the car, it has to be done.

They probably could but I don't want to invest another 2-3 hundred in a $4-5 hundred dollar tach!! Holy crap did I just say 2-3 & 4-5 hundred what am I thinking.


P.s. The sender did the trick. Temp gauge working!

[Nathan289]

Find a $100 vintage looking sun pro.. I saw a nib one listed on evil pay yesterday.

Moon eyes makes a sun pro knock off.

Autometer sells vintage repops last time I looked they had something similar to the sprint tach but it was $250..

[Luva65wagon]

I've never even taken the one I have out of the box yet. It, as I recall, has the Sprint logo etc but how much from there it deviates, I don't recall at the moment.

I have DSII is both cars now, so I'm not sure if even I could use it, or the original. The original, as I mentioned when looking at it on Sunday, is connected in-line with the ignition somehow (have not seen the schematic, so not 100% where and how) but was told if the tach fails - you are F.O.R.D.

Good to know the temp gauge works now. Too bad it didn't, by some miracle, fix the 42 MPH thing too.