Is use a mechanical boost gauge mounted into the heater cover. Works like a charm, showing vacuum overnight and system pressure when underway! Good for low coolant diagnosis and cap seal issues.

Frank Grunthaner

Sent from my iPhone

> On Jan 1, 2016, at 10:46 AM, OlRivrRat <OlRivrRat@COMCAST.NET> wrote:
> 
>                Larry
> 
>        A Boost Gauge might work ~
> 
> 
>> On 1 Jan , 2016, at 11:17 AM, Larry Alofs wrote:
>> 
>> Once, a few years ago, someone on this list said that he had a coolant
>> pressure gauge on his dash.. I have wanted one ever since, but have not run
>> across a suitable gauge that would read a reasonable amount of both
>> pressure and vacuum.  I would also need to find or make a suitable fitting
>> to attach to the top of the radiator (banjo bolt?).  Maybe some day...
>> 
>> Larry A.