Running Mechanical and Electric Oil Pressure Gauges

I would like to run 2 oil pressure gauges. One one my firewall and one inside the car. I have two Stewart Warner Twin Blue gauges but one is mechanical and one is electric.
On my 302 I have the electric sending unit (pictured)


Where can I put the fitting for the mechanical gauge? There are a few 1/4-NPT fittings on the block. Can I use one of those or does it need to be close to the oil pump?

Thanks

 

"T" it right there

 

I can't. The electric is wired while the mechanical gauge is copper tube.

 

Duh, stupid me, I could "T" it before the electric sending unit. Is that what you mean?

 

I think he means 'T' the 1/8" or 1/4" NPT port, not the sender unit. This method is not only logical but will provide a good base line on the gauges (to see if one is high or low.) As a general rule, I would trust the mechanical gauge any day.

 

Unscrew the sender and install a tee. Put the sender on one leg of the tee and the mech gauge fitting on the other.

 

Yes, at the block.

 

did the stock oil sending unit work with the electric stewart warner gauge ? curious since I am wanting to do the same.. IF so, is it accurate or should I go ahead and purchase a SW sending unit

 

From what I can tell the stock sending unit is just for the idiot light. I haven't verified it for certain because I haven't had it connected yet. Things are going a little slower these days.

 

The electric is just an idiot light. Use the mechanical one if you want e reading on pressure.

 

I'm running both. Just put a "T" in. Easy.