Mechanical tach-drive

[A-2 ace]

I'm looking into carb swapping my 88 tbi... The dizzy I'm looking to purchase stats in has no mechanical tach drive? Does this mean that if I want to run a tach in the future I won't be able to?

 

[PlayingWithTBI]

No, you run an electrical tach signal off the coil (white wire). The same as it's always been on these trucks.

 

[A-2 ace]

@PlayingWithTBI ok that makes sense.. this is my first time building a truck/car, I've owned the same little car since high school, and I've never had anyone around me to teach me.. so all these technical references are new to me also

 

[PlayingWithTBI]

Enjoy, before long you'll get the bug and decide "what the hell" on every turn, LOL.

 

[A-2 ace]

It's funny I've never owned a truck but always wanted one and some how I land up with two in the same year..

 

[skylark]

A tach drive distributor was used for a mechanically driven tach. It was a cable that was driven by the distributor. Corvettes through about the mid 70's had them.

 

[L29Sub]

Chevy gas V8 (BB & SB) marine engines in 60s and 70s also had delco mechanical tach drives.
HEI has electronic tach drive built into it. Three wires: power, ground, tach. Too simple.
No reason at all to go mechanical.
A universal tach can also be alternator driven.

Sent from my SM-G965U using Tapatalk

 

[Sparkysikes]

I don't have a distributor. Mine is off the alternator. Let that sink in Ace...

 

[A-2 ace]

@Sparkysikes do you have a magnetic proximity tach?

 

[Sparkysikes]

Diesel. No spark. I have to run a certain diameter pulley or it throws off my rpm. I believe it's a 3 wire. Can't change crank pulley either