Cable driven tach

[k20]

I recently aquired several rebuilt 6.2's. One of them has, in place of where the vacuum pump is on my cucv, a 'device' with what appears to be a place to screw a speedometer cable to the top. I can only assume this is for a cable driven tach. Am I correct in this assumption, and what type of tach should I be looking for for my 6.2?

Im not looking for any kind of historical accuracy, etc, as this truck is strictly offroad and I am just wanting to have a warning so I do not over rev the engine. Also does anyone know what 'ratio' tach I should be looking for. I was doing some searching and found some tach's with a 1:2 ratio, 2:1. 4:1. etc.

 

[k20]

anyone?

 

[cjkeeliii]

Can you post pix?

 

[k20]

This is what is in the back of the engine that looks like a tach drive, am I correct? And yes I know my dig camera sucks, its about 10yrs old, just cant afford a new one.

 

[319]

Could this be where the tach adapter for the STE/ICE connects to?

 

[k20]

Whats the STE/ICE? Looks kinda like that plug you posted a pic of.

 

[AJMBLAZER]

Sort of an early diagnostics machine. Does have a tach function though.