tachometer
Senior User
Joined: Apr 2009
Posts: 105
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Montana, I think the OP meant how do you actually measure the RPM with the tach. Like where do you hook it up to besides ground and power.
I dont wanna come off as an acehole but I'm also very curious to this as well. I'm going to install a tach a little later as well and would like to know as well.
Say your dentside never came with a tach. How does one install an aftermarket one. excluding the asthetics like mounting and tucking wires and all that.
I dont wanna come off as an acehole but I'm also very curious to this as well. I'm going to install a tach a little later as well and would like to know as well.
Say your dentside never came with a tach. How does one install an aftermarket one. excluding the asthetics like mounting and tucking wires and all that.
Junior User
Joined: Jun 2009
Posts: 64
Likes: 0
My '78 has the following that I had to figure out:
From Tach --------------- other end
Red ---------------------- +12v switched (fuse box in mine)
Black -------------------- Ground (bettery in mine, after being spliced to a yellow wire)
Green ------------------- Tach Test "pin" on coil (after being spliced to a yellow wire too)
Blue ---------------------Dunno. Just has bare wire. Sounds like it should be spliced into the dash lighting circuit.
From Tach --------------- other end
Red ---------------------- +12v switched (fuse box in mine)
Black -------------------- Ground (bettery in mine, after being spliced to a yellow wire)
Green ------------------- Tach Test "pin" on coil (after being spliced to a yellow wire too)
Blue ---------------------Dunno. Just has bare wire. Sounds like it should be spliced into the dash lighting circuit.
Post Fiend
Joined: Apr 2008
Posts: 8,261
Likes: 15
From: Big Sky Country
Too many beers lastnight, i meant coil not tach lol, sorry for the confusion.
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Zombie Survivalist
Joined: Feb 2009
Posts: 14,809
Likes: 3
From: Rock Springs, WY, USA
i would take pics to show you how i did mine in my 76, but the trucks in colorado, and im in north dakota, so yeah... i put it in the corner of the window and the dash, and there is just enough room between the dash and side panel to run the wires down inconspicuously and then you can run them through existing holes in the firewall and keep them all out of sight.
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Senior User
Joined: Apr 2009
Posts: 105
Likes: 0
Good stuff. So the tach measures RPM by reading a signal from your coil?
I'm going to replace all my gauges with autometer stuff and make a new plate fill in where the original plastic gauge cluster is.
The PO of my truck hacked the plastic up trying to install an aftermarket stereo so it looks terrible so I'm gonna replace it with a racy looking flat sheetmetal panel with enough gauges to make you think you're in a fighter jet lol
I'm going to replace all my gauges with autometer stuff and make a new plate fill in where the original plastic gauge cluster is.
The PO of my truck hacked the plastic up trying to install an aftermarket stereo so it looks terrible so I'm gonna replace it with a racy looking flat sheetmetal panel with enough gauges to make you think you're in a fighter jet lol
Zombie Survivalist
Joined: Feb 2009
Posts: 14,809
Likes: 3
From: Rock Springs, WY, USA
Good stuff. So the tach measures RPM by reading a signal from your coil?
I'm going to replace all my gauges with autometer stuff and make a new plate fill in where the original plastic gauge cluster is.
The PO of my truck hacked the plastic up trying to install an aftermarket stereo so it looks terrible so I'm gonna replace it with a racy looking flat sheetmetal panel with enough gauges to make you think you're in a fighter jet lol
I'm going to replace all my gauges with autometer stuff and make a new plate fill in where the original plastic gauge cluster is.
The PO of my truck hacked the plastic up trying to install an aftermarket stereo so it looks terrible so I'm gonna replace it with a racy looking flat sheetmetal panel with enough gauges to make you think you're in a fighter jet lol
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