Gilbert restore the tachometer of the DW15 and look not digital, but ancient solidity.
But we do have a question about this tachometer.
Why is there a lock ?

Hi, Quad.
My guess would that the lock was to stop people getting into the tachometer and fiddling with the recorder needle that remains pegged at the highest revs recorded by the tacho. This arrangement was an early attempt to stop people over-revving these engines because doing so left a record via the position of that recorder needle.

Just my 0.02.

I am still giggling over Dea's Burglar Proofing title, I have seen this years ago in 769 dumpers, no 1 had the key for the thing but a second hand inside the face would lock in place showing engine over speed at a pre set position, this I took to point to incorrect driving, at that time all the dumpers on the site had Prayer Brakes instead of air brakes due to no money to fix e'm, so they used to be loaded heavy and driven steady, so as already said Over Speed record, the dumpers had air start engines just thought I would say.
tctractors

"Deas wrote:

Hi, Quad.
My guess would that the lock was to stop people getting into the tachometer and fiddling with the recorder needle that remains pegged at the highest revs recorded by the tacho. This arrangement was an early attempt to stop people over-revving these engines because doing so left a record via the position of that recorder needle.

Just my 0.02.

Back in the day most pull Skinner's (scraper operators) had tac key on their key ring.

Kelly

Thanks for the answer.

New oil pressure gauge

nice new oil gauge, where could you buy this antique gauge?

What a great find. That has been in the box about as long as I have been around.

Having a tach key was a must and I kept one on my key ring! Going downhill and you if started to bounce a little, the engine will surge and the tach needle will jump up higher then the actual RPM's. On one of the spreads I worked on that included ten 657's, the mechanics would check tachs at noon and quitting time. If the tattle tale was pushed off the peg, the operator went down the road.

Marcoten ,


I could help you out with a gauge if you need one.


HOLLANDCAT