Elect TACH conversion
Thread Starter
Instructor
Joined: Dec 2000
Posts: 188
Likes: 0
From: Boise,Idaho,U.S.A.
Elect TACH conversion
I have A "72" with the mechanical tach drive. Thinking of installing HEI. Anybody convert there mech tach to A electronic tach. Where did you buy parts. How difficult to do the conversion. THANK YOU
Gary :chevy
Gary :chevy
Instructor
Joined: Oct 1999
Posts: 187
Likes: 0
From: Bellevue WA
Re: Elect TACH conversion (AV8RSVT)
I just bought a tach out of a 76 vette on e-bay. I had to change the faceplate because the numbers weren't green, and my redline was different, but that wasn't too tough. Don't know about hooking it up to an HEI though. I'm running an MSD6 and with that unit you do need to buy their adapter or you'll blow the tach circuit board (trust me on this one!)
Melting Slicks
Joined: Nov 2003
Posts: 2,668
Likes: 118
From: St. Charles Mo
CI 5 & 8 Veteran
Re: Elect TACH conversion (LT-1 Larry)
LT-1 Larry & zwede;
I want to do that same conversion on Project RamJet! I purchased an electronic tach out of a 77 and want to swap face plates. Problem is, it looks like the plates were mounted differently. My old mech tach has the face plate mounted with small screws where the 77 tach looks like it was rivited on....plus the spacing on the mounting holes looks to be different. tell me more on how you swapped faceplates.
Bullshark
I want to do that same conversion on Project RamJet! I purchased an electronic tach out of a 77 and want to swap face plates. Problem is, it looks like the plates were mounted differently. My old mech tach has the face plate mounted with small screws where the 77 tach looks like it was rivited on....plus the spacing on the mounting holes looks to be different. tell me more on how you swapped faceplates.
Bullshark
Race Director
Joined: Sep 1999
Posts: 11,358
Likes: 379
From: Plano TX
Re: Elect TACH conversion (Bullshark)
Correct. One is riveted, one bolted. I just drilled the rivets. The hole spacing is slightly different. I elongated the holes until they fit. Yes, on one side you can see the hole but once it is installed it is hard to see and not noticable at all. If you look for it you can see it.
