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  • 1965 - 1973 Classic Mustangs -General/Talk-
  • Classic Mustang Specific Tech

Tachometers

  • Thread starter Thread starter notny41
  • Start date Start date Sep 13, 2004

notny41

Member
Aug 15, 2004
204
0
16
Minnesota
Sep 13, 2004
#1
  • Sep 13, 2004
  • #1
I would like to know what rpm's I am shifting on. I have a 65 fastback 289 4v with dual exhaust.

I don't necissarily want to have a tachometer permanently mounted in the car.

Here's what I'm wondering: will a motorcycle or snowmobile tachometer work on a car engine? I would just like to hook one up for a few drives and then disconnect it again once I have an idea of the rpms I am shifting at. I don't want to spend much (if any) money on a tach. I do have snowmobiles that would be willing to temporarily donate their tach if that would work.

Thanks - P
 

66P51GT

New Member
Nov 7, 2003
721
1
0
Cerritos, CA
Sep 13, 2004
#2
  • Sep 13, 2004
  • #2
It has to be switchable to a V8. Otherwise you will get faulty readings.
 

notny41

Member
Aug 15, 2004
204
0
16
Minnesota
Sep 13, 2004
#3
  • Sep 13, 2004
  • #3
Gotcha, yeah, I don't have a v8 in my sled...makes sense - thanks!
 
F

ForceFed70

That's why they call it "dope"
Founding Member
Dec 6, 1999
4,818
1
69
BC Canada
Sep 13, 2004
#4
  • Sep 13, 2004
  • #4
66P51GT said:
It has to be switchable to a V8. Otherwise you will get faulty readings.
Click to expand...


Exactly!

You may be able to away with setting it for a 4cyln and then dividing your reading by 1/2 (ie the guage says 12,000RPM but your engine is really only doing 6000RPM)
 
V

VictorII

New Member
Jun 19, 2004
148
1
0
Cotati, CA
Sep 13, 2004
#5
  • Sep 13, 2004
  • #5
notny41 said:
I would like to know what rpm's I am shifting on. I have a 65 fastback 289 4v with dual exhaust.

I don't necissarily want to have a tachometer permanently mounted in the car.

Here's what I'm wondering: will a motorcycle or snowmobile tachometer work on a car engine? I would just like to hook one up for a few drives and then disconnect it again once I have an idea of the rpms I am shifting at. I don't want to spend much (if any) money on a tach. I do have snowmobiles that would be willing to temporarily donate their tach if that would work.

Thanks - P
Click to expand...

I use a 2" Sun screwed to the radio grill. It is so small that you can hardly notice it because it is in front of the wipers, plus I turn the light off at night. One screw an it's out, but you will have to have a plug for the wires.
 
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