IM-6 Tach

Can anyone tell me what IM uses for a tach in a 6 cylinder 911 model and what diameter it would be.

Thanks, Terry

Nobody can tell me the diameter of the tach in a 911 IM? Guess it's time to bug Henry!

Terry, all the late 6 cylinder cars I saw had custom gauges. Call North Hollywood speedometer and mention Henry at IM.

Thanks Marty, yeah I was thinking to take an old 911 one and put it in the existing tach housing. I think older tachs "68-69) had smaller diameter than newer?

I'm about 98% sure that all 911/912 tachs are the same size, even the old 3 guage 912 tachs.

I know you need to be 100% - so follow through because the chinese/brazil, etc., tachs are bigger than the VDO's. Not sure what Henry is using, wouldn't surprise me if he used 911 guages and just had them refaced.

If you don't mind waiting a couple of days, I've got an SWB (can't remember if it's a 67 or 68) car at the shop. I can measure/compare to the SC's I've got. That would definately answer at least that part of the question.

angela

Thanks Angela, I've got plenty time on this one.

Will do - I'll run out tomorrow and take care of the old/new 911/912 size question for you.

angela

911 tach dated 9-71. 114mm O.D., to outside of bezel(black, so is not the real early chrome style) looks like 120mm, the factory gasket looks about 2mm. If you use the gasket, your hole should be about 117-118mm, without gasket I'd leave it at 114mm. FYI, 911 gauges rely on the gasket to hold them in the dash, no brackets and thumbscrews like on our replica VDOs.....my long wheelbase gauge should be the same as Angela's SC stuff though.

Thanks Danny, I'll have to pull the one in the IM and see what we got.

It is, I measured them yesterday along with the tach from a '66 3 guage 912. The 81 SC, the 85 Carrera and the '66 912. The '66 did have a thicker bezel, but the backside was the same (the part that goes THROUGH the dashboard). All 3 use the same gasket.

They are all the same 114mm.

angela