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#1
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Bench Testing a Dash Tach
Is their a simple way to test a tachometer on the work bench? I have an original 65 dash tach I want to test, Thanks.
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#2
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Mr Serio may be able to help you on testing it....
alot of them work but are poor at calibrating and showing correct rpm I just hook mine up with a known good SUN tach I have and rev up the old 350 chebby and watch em both Scott ... my junk only revs to 4200 |
#3
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#4
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You can partially test it on the bench, which may be good enough for your purposes, if you have a drill that the speed is known. It helps if you have a spare points dist, not necessarily a Pontiac. I remove the dist gear, leaving just the 1/2" shaft. I fit a short piece of 1/2" rod into the chuck. You can also use a 1/2"drill bit. I use some 1/2" hose as a flexible drive to drive the dist shaft. Hook up the tach & spin the dist. Tach should register double the speed of the drill.
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#5
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Exactly. You can likely even build it and put it in a little box that has a knob to set the output to different RPM values. It's a minor amount of electrical circuits to do it that you used to be able to get at Radio Shack.
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#6
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Interesting....I thought that I may have had an old Function Generator...but all I found in my old '80s stuff was an BK RF generator and an old scope. I could have sworn that I had a BK generator around. I would love to see a schematic for the hook up?..Just in case I can find it.. I have a serious 'can't see the forest for the trees' situation around here.
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Greg Reid Palmetto, Georgia |
#7
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#8
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Exactly. Something like a 741 or a 7414 with a mechanical knob to adjust the resistor could probably be built for less than $15 and make it look nice. It doesn't need ridiculously fast or ns-sharp edges.
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#9
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