[RoyL]

Les,
Thanks. The gauge and dash cluster are out of the truck. Was able to get the gas gauge needle to move with battery across the terminals, so believe the gauge is good. Not sure how to bench check the gauge out of the truck to see if it’s a 30 ohm . . . I have an Autowire harness installed (well mostly). The gauges were not hooked up when I bought the truck, so not sure if it worked or not.

HOWEVER, I cleaned up my old crusty sender and did get it to read from about 34 ohms down to near 0 moving the float, so the 0-30 ohm sender from Brothers should work.

On the changeover from 30 to 90 ohms by GM, guy at Brothers said GM didn't change from 30 to 90 ohms until '67. And from others here, jbgroby and protrash64, looks like that may be true. I did run across a thread somewhere that said GM cars may have went to 90 ohm earlier, but the trucks not till 67 . . .
I will let ya’ll know once I get the sender installed and checked out.
Thanks to all, the simple stuff ain't so simple . . . !
Roy