Okay so on the SBEC there is a pin for "provision for tach conn." is there anyway to wire a regular tach into this?

 

I believe the aftermarket tach manufacturers like Isspro and Autometer recognize this plug in their wiring.

The '92-'93 1st gen trucks have the plug taped (or hanging) near the fusebox.
It's a 4 pin flat plug, that is black in color.

Mark.

 

Yeah i did some more research and found that you can hook into this pin/plug like you said under the dash.

the OEM factory tachometer plug offers the following:

- 18ga Black = +12vdc for gage lights
- 20ga Orange = 12vdc Common
- 18ga Red = Switched +12vdc
- 20ga Grey w/light blue tracer = Tachometer Signal From PCM

 

Yeah, those are the colors on my stock tach, on my desk, here.

Mark.