64-66 Chev-GMC pickup Tach dash questions

I just picked up a gauge cluster with a tachometer in it for a 64-66 Chevrolet pickup at the Goodguys in Scottsdale.

I have a few questions about using it.
I'm planning on using this on my '64 C10 with a 292. It is currently running the first gen HEI unit for that engine.


I know most aftermarket tachometers are V8 or 6 cylinder specific. I think most of these clusters came in 2ton trucks, so, I am wondering if I will be able to use the tachometer on my 292. I know some of the 2 tons came with 292s, but, some came with 409s too. This tach has the 4 grand redline.


1: What am I going to need to do to tell which engine this tach is for, and will I need to adapt it for my use? OR, am I overthinking this?

2: Since I switched to HEI, what do I need to do to make this tach work with HEI, or will it be ok as is?

Thanks

 

i don't think hei will bother it. i think they used a sun unit under dash with the gauge and that is where you select cly's. i might be wrong, but i had one with this setup and i think it was original. good luck!

 

67-72chevytrucks.com

 

I had an old tack from a 63 Impala and if I remember correctly it was stamped 8cyl on the back.

 

Also, that redline is an adjustable tab, it can be reset anywhere because it slides.

The earlier 60s truck tachs needed the Sun transmitter box, later ones were stand alone. A I recall, the later ones, if you peek indide from the back, it will be crammed full of components, where the transmitter type tach head is quite empty