To add the extra ports needed for my aftermarket gauge sender and electric fan switch on my 348 I bought a cast iron water neck from Rock Auto, Dorman #902-2017 for about $8 and drilled and tapped it myself - the material is thick enough that you don't need a "boss". A little tight with a 3x2 setup, but it works perfectly.
I plugged my volt meter into the ignition slot on the fuse block. The oil gauge is tied into the oil pressure switch. I teed the coolant temp sensor in with the original one. I retained use of the lights. I found a fitting that will get rid of the coupling and nipple and make it a little more streamlined so the throttle return spring won't rub
Hobart, that part is us$12 on summit, us$32 on Amazon us, and cdn$ 152 on Amazon Canada, about us$114. It’s all made in the same place, China...........
I think the first pic is "skewed" slightly due to the angle. I haven't done anything to the voltage regulator since I've had the car (6.5 years now). Shouldn't the charging system be putting out 14.6 V anyway while the car is running?
I'm always checking these gauges anyway when I'm driving around town and on the highway. Knock on wood, I've never had any issues with anything on Blanche (electrical or otherwise) since I got her "dialed in" after purchase. (Well maybe a gas gauge issue, but that's a story for another post.)
I brazed a coupling to a new freeze plug and installed it by the oil sending plug. This way the mechanical sending probe is out of sight and I still have the idiot lite.