Just a thought guys - the location you're referring to is downstream of the thermostat. What that means is that any temperature reading there won't reflect what's going on in the engine until AFTER the t'stat opens. And if the t'stat should stick closed - you want your temp gauge to show you that. It won't have an easy time doing that if your temp. sender is located downstream of the t'stat in the housing. I'd put temp switches there to operate the fan, or I'd re-locate the stock sensor there if you want to run an aftermarket gauge. But I'd put the good gauge's sender in the manifold.