Fitting modern CHEAPO tachometers to an Imp

[John A. Ross]

Well I have bene hunting high and low for a nice Smiths tacho as was fitted to the car originally (1k rpm 80mm or so) but prices are way too high.

So fitted a nice £15 one which will do for now. Going to modify it a little inside later to add a beep sound when the limit is triggered just well, as I can




EXAMPLE CHEAPO TACHOMETER ON EBAY


Only thing is these are modrn servo based instruments and the input filtering is worth about two rows of horse dung and thats doing them a favour !

The spikes from Imp ignition are simply too much and the tacho display resembles a performers feet doing the river dance more than a meter

So magnifier out and small filter made up, yes there really is 6 parts on there !

Nice stable gauge, sorted

[Dave Lane]

get an 80mm Yazaki rev counter , just as good as Smiths and easier to wire

[John A. Ross]

Dave,

I had the 52mm Yazaki in the middle console but pulled it for now in lieu of the temp gauge. Worked perfectly, lovely little gauge

Line up still work in progress might put it back there short term

Car originally had the 80mm or so smiths 10k rpm counter mounted under the dash on right hand side of binnacle, hopefully pick on up and move the hazard switch from there.

Going to leave them be for now Dave.

Picked up some other bits to recycle mean time.

Reckon should work on getting the car driving, hopefully the windscreen is not far away !

[Gary Whitaker]

Can anything be done with the stiletto rev counter , I here they are a notoriously inaccurate,why are they so bad ?
best regards Gary

[John A. Ross]

Gary, yes you can change them from induction pickup to direct pulse, I am sure one of the fellas on the Facebook Group does the modules for it.

Most common reason i find is bad wiring, the wire used for pickup is shared and imp wiring not the best.

There are a few parts inside that give up with old age and lack of use, often replace these and its good again.

If you want me to test it Gary I can put it on the bench with the pulse generator and see how it reads, you might have a good one. Just send it up.


- John

[Gary Whitaker]

They don't look very easy to get into?

[John A. Ross]

Not that difficult, seen folks peel smiths gauges to bits, just needs levered in right place. Cant recall the Stiletto one though but pretty much all same, should be able to get the right to shift and it will line up witha few slots and should pop off, then peel the layers which usually includes a few rubber seals that fall apart occasionally.