I've completed converting my Bugeye over to negative ground, but I am
having a problem converting the tachometer from positive ground to
negative. The only tach conversion instructions I have been able to find
on the internet or books are for a different type (earlier positive
ground tachs?) and the configuration & colored wires do not match. I
need advise from Listers who have done a similar tach conversion in past.
First ... tach is not original Bugeye. My tach is from a later Mark 2
Sprite (HAN7), specifically a Smiths RVI2401/00 Positive Earth. The
white wires wrap around the coil(?) and come out the back. One wire has
a male connector, the othe a female. I've reversed my connections to the
white wires per the instructions. Between the 2 white wires is a spade
connector which I assume is connected to my power wire. I've grounded
the tach at one of the bracket screws. Inside the tach are 3 wires ...
1 yellow, 1 red and 1 black. According the instructions there are
supposed to be 1 brown wire and 1 green wire which I unsolder and switch
(instructions are not in front of me so don't yell if I'm wrong about
brown/green). So this is where I am most confused. Help!!
PS. Tach is from parts car so I do not know for certain that it worked
before. All the other gauges are fine, so I have assumed tach is also.
PPS. I have a MGB negative ground tach which I have connected to the
car & it works, so rest of my wiring should not be the problem. Tach is
much smaller, it does not fit in dash otherwise I would just use it.
Thanks in advance for any suggestions.
Jim Rogers
San Juan Capistrano, CA
60 Bugeye
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