1970 Tach Conversion
Dr. Detroit
Joined: Mar 2012
Posts: 10,097
Likes: 4,027
From: New Braunfels Texas
I have the Zip kit.....when I got the car the tach was in but not wired.....easy three wire hookup just like a regular tach and it is within 100 rpm of my Bosch Timing light RPM reading.....which I consider to be pretty accurate as it is coming off the wire.
A must do upgrade on these if your cable freezes up and you can use any distributor you want.
Jebby
A must do upgrade on these if your cable freezes up and you can use any distributor you want.
Jebby
Drifting
Joined: Feb 2007
Posts: 1,498
Likes: 206
From: Pearland Texas
St. Jude Donor '09
I have the Zip kit.....when I got the car the tach was in but not wired.....easy three wire hookup just like a regular tach and it is within 100 rpm of my Bosch Timing light RPM reading.....which I consider to be pretty accurate as it is coming off the wire.
A must do upgrade on these if your cable freezes up and you can use any distributor you want.
Jebby
A must do upgrade on these if your cable freezes up and you can use any distributor you want.
Jebby
Drifting
Joined: Feb 2007
Posts: 1,498
Likes: 206
From: Pearland Texas
St. Jude Donor '09
Former Vendor
Joined: Aug 2006
Posts: 76,656
Likes: 1,852
From: Jeffersonville Indiana 812-288-7103
St. Jude Donor '08-'09-'10-'11-'12-'13-'14-'15
Zwede is right and he's pretty sharp too: 
So, here is the low down as I see it on the conversions... If you own a 1968-1974 car you can purchase the conversion kit and it'll work fine. The major issue is that when you receive the kit's they are not calibrated properly.... and I mean this... they suck as far as calibration so you'll have to dial it in. (they have an adjustable pot on the board)
Do a zero set on the needle with power and ground, then install the needle... Then you'll need to calibrate the movement to the face. So install the kit, and before you put the dash back together hook up a dwell meter (set to RPM's) and dial in the pot on the meter. That's about the easiest way to do it unless you have a signal generator. I make the signal generators for the 75 and newer cars and they work great but who want's to spend 100 bucks for something they'll use one time when you can go buy a cheap dwell meter for a fraction of the cost.
So, here is the low down as I see it on the conversions... If you own a 1968-1974 car you can purchase the conversion kit and it'll work fine. The major issue is that when you receive the kit's they are not calibrated properly.... and I mean this... they suck as far as calibration so you'll have to dial it in. (they have an adjustable pot on the board)
Do a zero set on the needle with power and ground, then install the needle... Then you'll need to calibrate the movement to the face. So install the kit, and before you put the dash back together hook up a dwell meter (set to RPM's) and dial in the pot on the meter. That's about the easiest way to do it unless you have a signal generator. I make the signal generators for the 75 and newer cars and they work great but who want's to spend 100 bucks for something they'll use one time when you can go buy a cheap dwell meter for a fraction of the cost.
Last edited by Willcox Corvette; Apr 7, 2019 at 07:42 PM.
