check the link, you can get the button connection on rock auto. i ordered one the other day
I've seen the button one there but not to confuse or misdirect the OP I'm looking into if there is a change between the '78 & '79 temp gauges as per A/G-bodies between the '64-'78 & '79 (1/2" NPT), '80-'88 (3/8" NPT) senders. I do have the button one in my head ('70 L48) but with seeing the different p/n's for '78 & '79 makes me really want to also double check for myself. I do remember going over the ohms rating in the old BW catalog that my employer at the time had (around '07-'08) & was believing I grabbed the right one. I'll have to get out to the garage & see what the box list for the p/n. FYI, I have a '81 using '86-'88 gauges.