70 Judge question hood tachs
 

Picked up another 70 Judge this one as the other one has a hood tach on the PHS but this one has a tube that comes off the heater box and goes to the tach anyone have a date when they started using the vent hose https://uploads.tapatalk-cdn.com/202...1d7bca3120.jpghttps://uploads.tapatalk-cdn.com/202...5ecdf44963.jpg

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I think all 70 models with the tach had the heater to prevent fogging.

No they all did not have them
They started appearing in early april

hood tach heat vent
 

Correct. My 1970 was delivered to me in March 1970 hood tach-no heater vent provision

I had an April built 70 survivor judge that had the heater setup to the tach.

I have an Oshawa built 1970 GTO Judge, factory UB5 hood tach car, late 06B, second week of June 1970 build date, with hood tach heater nipple on non ac heater box like you posted.

Never heard of an earlier car at a different US assembly plant having one ,neat stuff.

My Arlington built Judge built second week of June has it...

My 70 Judge...built Sept 1969...does not have it.....

Here is a 03A Pontiac build GTO with the nipple for the hood tach heat. It has a 03-13 ship date.

Dennis

I guy I know who restored a 69 Judge with an April date has one but I think he added that during the restoration.

You are correct, hood tach heating/ventilation certainly didn't come on any '69 Pontiac, so that was added.

Dennis

For me biggest problem was fogging after a car wash. Vent took care of that.

Does anyone have a picture of the nipple on the tach where the hose goes. My 70 Judge has the nipple on the heater box and the hose goes thru 2 check valves or ?, then to back of carb. This is on a mostly original car.

Here's a picture of a faithful reproduction hood tach from RC Tach (Randy Watson) with the nipple for the hose connection.

Dennis